diff --git a/samples/Mvc.Server/Startup.cs b/samples/Mvc.Server/Startup.cs
index df5a8cb7..d6bad2d6 100644
--- a/samples/Mvc.Server/Startup.cs
+++ b/samples/Mvc.Server/Startup.cs
@@ -145,15 +145,16 @@ namespace Mvc.Server
 
                 if (await manager.FindByClientIdAsync("mvc", cancellationToken) == null)
                 {
-                    var application = new OpenIddictApplication
+                    var descriptor = new OpenIddictApplicationDescriptor
                     {
                         ClientId = "mvc",
+                        ClientSecret = "901564A5-E7FE-42CB-B10D-61EF6A8F3654",
                         DisplayName = "MVC client application",
-                        LogoutRedirectUri = "http://localhost:53507/signout-callback-oidc",
-                        RedirectUri = "http://localhost:53507/signin-oidc"
+                        PostLogoutRedirectUris = { new Uri("http://localhost:53507/signout-callback-oidc") },
+                        RedirectUris = { new Uri("http://localhost:53507/signin-oidc") }
                     };
 
-                    await manager.CreateAsync(application, "901564A5-E7FE-42CB-B10D-61EF6A8F3654", cancellationToken);
+                    await manager.CreateAsync(descriptor, cancellationToken);
                 }
 
                 // To test this sample with Postman, use the following settings:
@@ -167,14 +168,14 @@ namespace Mvc.Server
                 // * Request access token locally: yes
                 if (await manager.FindByClientIdAsync("postman", cancellationToken) == null)
                 {
-                    var application = new OpenIddictApplication
+                    var descriptor = new OpenIddictApplicationDescriptor
                     {
                         ClientId = "postman",
                         DisplayName = "Postman",
-                        RedirectUri = "https://www.getpostman.com/oauth2/callback"
+                        RedirectUris = { new Uri("https://www.getpostman.com/oauth2/callback") }
                     };
 
-                    await manager.CreateAsync(application, cancellationToken);
+                    await manager.CreateAsync(descriptor, cancellationToken);
                 }
             }
         }
diff --git a/src/OpenIddict.Core/Descriptors/OpenIddictApplicationDescriptor.cs b/src/OpenIddict.Core/Descriptors/OpenIddictApplicationDescriptor.cs
index 5738113a..11cbcdae 100644
--- a/src/OpenIddict.Core/Descriptors/OpenIddictApplicationDescriptor.cs
+++ b/src/OpenIddict.Core/Descriptors/OpenIddictApplicationDescriptor.cs
@@ -1,4 +1,7 @@
-namespace OpenIddict.Core
+using System;
+using System.Collections.Generic;
+
+namespace OpenIddict.Core
 {
     /// <summary>
     /// Represents an OpenIddict application descriptor.
@@ -9,37 +12,37 @@
         /// Gets or sets the client identifier
         /// associated with the application.
         /// </summary>
-        public virtual string ClientId { get; set; }
+        public string ClientId { get; set; }
 
         /// <summary>
         /// Gets or sets the client secret associated with the application.
         /// Note: depending on the application manager used when creating it,
         /// this property may be hashed or encrypted for security reasons.
         /// </summary>
-        public virtual string ClientSecret { get; set; }
+        public string ClientSecret { get; set; }
 
         /// <summary>
         /// Gets or sets the display name
         /// associated with the application.
         /// </summary>
-        public virtual string DisplayName { get; set; }
+        public string DisplayName { get; set; }
 
         /// <summary>
-        /// Gets or sets the logout callback URL
+        /// Gets the logout callback URLs
         /// associated with the application.
         /// </summary>
-        public virtual string LogoutRedirectUri { get; set; }
+        public ISet<Uri> PostLogoutRedirectUris { get; } = new HashSet<Uri>();
 
         /// <summary>
-        /// Gets or sets the callback URL
+        /// Gets the callback URLs
         /// associated with the application.
         /// </summary>
-        public virtual string RedirectUri { get; set; }
+        public ISet<Uri> RedirectUris { get; } = new HashSet<Uri>();
 
         /// <summary>
         /// Gets or sets the application type
         /// associated with the application.
         /// </summary>
-        public virtual string Type { get; set; }
+        public string Type { get; set; }
     }
 }
diff --git a/src/OpenIddict.Core/Descriptors/OpenIddictAuthorizationDescriptor.cs b/src/OpenIddict.Core/Descriptors/OpenIddictAuthorizationDescriptor.cs
index a9338799..04b129ec 100644
--- a/src/OpenIddict.Core/Descriptors/OpenIddictAuthorizationDescriptor.cs
+++ b/src/OpenIddict.Core/Descriptors/OpenIddictAuthorizationDescriptor.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 namespace OpenIddict.Core
 {
@@ -13,9 +14,10 @@ namespace OpenIddict.Core
         public string ApplicationId { get; set; }
 
         /// <summary>
-        /// Gets or sets the scopes associated with the authorization.
+        /// Gets the scopes associated with the authorization.
         /// </summary>
-        public IEnumerable<string> Scopes { get; set; }
+        public ISet<string> Scopes { get; } =
+            new HashSet<string>(StringComparer.Ordinal);
 
         /// <summary>
         /// Gets or sets the status associated with the authorization.
diff --git a/src/OpenIddict.Core/Managers/OpenIddictApplicationManager.cs b/src/OpenIddict.Core/Managers/OpenIddictApplicationManager.cs
index 6a784249..8a510128 100644
--- a/src/OpenIddict.Core/Managers/OpenIddictApplicationManager.cs
+++ b/src/OpenIddict.Core/Managers/OpenIddictApplicationManager.cs
@@ -206,9 +206,14 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns the client applications corresponding to the specified post_logout_redirect_uri.
         /// </returns>
-        public virtual Task<TApplication[]> FindByLogoutRedirectUriAsync(string address, CancellationToken cancellationToken)
+        public virtual Task<TApplication[]> FindByPostLogoutRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken)
         {
-            return Store.FindByLogoutRedirectUriAsync(address, cancellationToken);
+            if (string.IsNullOrEmpty(address))
+            {
+                throw new ArgumentException("The address cannot be null or empty.", nameof(address));
+            }
+
+            return Store.FindByPostLogoutRedirectUriAsync(address, cancellationToken);
         }
 
         /// <summary>
@@ -220,8 +225,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns the client applications corresponding to the specified redirect_uri.
         /// </returns>
-        public virtual Task<TApplication[]> FindByRedirectUriAsync(string address, CancellationToken cancellationToken)
+        public virtual Task<TApplication[]> FindByRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(address))
+            {
+                throw new ArgumentException("The address cannot be null or empty.", nameof(address));
+            }
+
             return Store.FindByRedirectUriAsync(address, cancellationToken);
         }
 
@@ -245,6 +255,25 @@ namespace OpenIddict.Core
             return Store.GetAsync(query, cancellationToken);
         }
 
+        /// <summary>
+        /// Retrieves the client identifier associated with an application.
+        /// </summary>
+        /// <param name="application">The application.</param>
+        /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
+        /// <returns>
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
+        /// whose result returns the client identifier associated with the application.
+        /// </returns>
+        public virtual Task<string> GetClientIdAsync([NotNull] TApplication application, CancellationToken cancellationToken)
+        {
+            if (application == null)
+            {
+                throw new ArgumentNullException(nameof(application));
+            }
+
+            return Store.GetClientIdAsync(application, cancellationToken);
+        }
+
         /// <summary>
         /// Retrieves the client type associated with an application.
         /// </summary>
@@ -332,25 +361,6 @@ namespace OpenIddict.Core
             return Store.GetTokensAsync(application, cancellationToken);
         }
 
-        /// <summary>
-        /// Determines whether the specified application has a redirect_uri.
-        /// </summary>
-        /// <param name="application">The application.</param>
-        /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
-        /// <returns>
-        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns a boolean indicating whether a redirect_uri is registered.
-        /// </returns>
-        public virtual async Task<bool> HasRedirectUriAsync([NotNull] TApplication application, CancellationToken cancellationToken)
-        {
-            if (application == null)
-            {
-                throw new ArgumentNullException(nameof(application));
-            }
-
-            return !string.IsNullOrEmpty(await Store.GetRedirectUriAsync(application, cancellationToken));
-        }
-
         /// <summary>
         /// Determines whether an application is a confidential client.
         /// </summary>
@@ -502,7 +512,8 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns a boolean indicating whether the client secret was valid.
         /// </returns>
-        public virtual async Task<bool> ValidateClientSecretAsync([NotNull] TApplication application, string secret, CancellationToken cancellationToken)
+        public virtual async Task<bool> ValidateClientSecretAsync(
+            [NotNull] TApplication application, string secret, CancellationToken cancellationToken)
         {
             if (application == null)
             {
@@ -528,7 +539,7 @@ namespace OpenIddict.Core
             if (!await ValidateClientSecretAsync(secret, value, cancellationToken))
             {
                 Logger.LogWarning("Client authentication failed for {Client}.",
-                    await GetDisplayNameAsync(application, cancellationToken));
+                    await GetClientIdAsync(application, cancellationToken));
 
                 return false;
             }
@@ -545,16 +556,25 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns a boolean indicating whether the post_logout_redirect_uri was valid.
         /// </returns>
-        public virtual async Task<bool> ValidateLogoutRedirectUriAsync(string address, CancellationToken cancellationToken)
+        public virtual async Task<bool> ValidatePostLogoutRedirectUriAsync(
+            [NotNull] string address, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(address))
+            {
+                throw new ArgumentException("The address cannot be null or empty.", nameof(address));
+            }
+
             // Warning: SQL engines like Microsoft SQL Server are known to use case-insensitive lookups by default.
             // To ensure a case-sensitive comparison is used, string.Equals(Ordinal) is manually called here.
-            foreach (var application in await Store.FindByLogoutRedirectUriAsync(address, cancellationToken))
+            foreach (var application in await Store.FindByPostLogoutRedirectUriAsync(address, cancellationToken))
             {
-                // Note: the post_logout_redirect_uri must be compared using case-sensitive "Simple String Comparison".
-                if (string.Equals(address, await Store.GetLogoutRedirectUriAsync(application, cancellationToken), StringComparison.Ordinal))
+                foreach (var uri in await Store.GetPostLogoutRedirectUrisAsync(application, cancellationToken))
                 {
-                    return true;
+                    // Note: the post_logout_redirect_uri must be compared using case-sensitive "Simple String Comparison".
+                    if (string.Equals(uri, address, StringComparison.Ordinal))
+                    {
+                        return true;
+                    }
                 }
             }
 
@@ -565,31 +585,40 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Validates the redirect_uri associated with an application.
+        /// Validates the redirect_uri to ensure it's associated with an application.
         /// </summary>
         /// <param name="application">The application.</param>
-        /// <param name="address">The address that should be compared to the redirect_uri stored in the database.</param>
+        /// <param name="address">The address that should be compared to one of the redirect_uri stored in the database.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns a boolean indicating whether the redirect_uri was valid.
         /// </returns>
-        public virtual async Task<bool> ValidateRedirectUriAsync([NotNull] TApplication application, string address, CancellationToken cancellationToken)
+        public virtual async Task<bool> ValidateRedirectUriAsync(
+            [NotNull] TApplication application, [NotNull] string address, CancellationToken cancellationToken)
         {
             if (application == null)
             {
                 throw new ArgumentNullException(nameof(application));
             }
 
-            // Note: the redirect_uri must be compared using case-sensitive "Simple String Comparison".
-            // See http://openid.net/specs/openid-connect-core-1_0.html#AuthRequest for more information.
-            if (string.Equals(address, await Store.GetRedirectUriAsync(application, cancellationToken), StringComparison.Ordinal))
+            if (string.IsNullOrEmpty(address))
             {
-                return true;
+                throw new ArgumentException("The address cannot be null or empty.", nameof(address));
+            }
+
+            foreach (var uri in await Store.GetRedirectUrisAsync(application, cancellationToken))
+            {
+                // Note: the redirect_uri must be compared using case-sensitive "Simple String Comparison".
+                // See http://openid.net/specs/openid-connect-core-1_0.html#AuthRequest for more information.
+                if (string.Equals(uri, address, StringComparison.Ordinal))
+                {
+                    return true;
+                }
             }
 
             Logger.LogWarning("Client validation failed because '{RedirectUri}' was not a valid redirect_uri " +
-                              "for '{Client}'.", address, await GetDisplayNameAsync(application, cancellationToken));
+                              "for {Client}.", address, await GetClientIdAsync(application, cancellationToken));
 
             return false;
         }
@@ -609,11 +638,43 @@ namespace OpenIddict.Core
                 ClientId = await Store.GetClientIdAsync(application, cancellationToken),
                 ClientSecret = await Store.GetClientSecretAsync(application, cancellationToken),
                 DisplayName = await Store.GetDisplayNameAsync(application, cancellationToken),
-                LogoutRedirectUri = await Store.GetLogoutRedirectUriAsync(application, cancellationToken),
-                RedirectUri = await Store.GetRedirectUriAsync(application, cancellationToken),
                 Type = await Store.GetClientTypeAsync(application, cancellationToken)
             };
 
+            foreach (var address in await Store.GetPostLogoutRedirectUrisAsync(application, cancellationToken))
+            {
+                // Ensure the address is not null or empty.
+                if (string.IsNullOrEmpty(address))
+                {
+                    throw new ArgumentException("Callback URLs cannot be null or empty.");
+                }
+
+                // Ensure the address is a valid absolute URL.
+                if (!Uri.TryCreate(address, UriKind.Absolute, out Uri uri) || !uri.IsWellFormedOriginalString())
+                {
+                    throw new ArgumentException("Callback URLs must be valid absolute URLs.");
+                }
+
+                descriptor.PostLogoutRedirectUris.Add(uri);
+            }
+
+            foreach (var address in await Store.GetRedirectUrisAsync(application, cancellationToken))
+            {
+                // Ensure the address is not null or empty.
+                if (string.IsNullOrEmpty(address))
+                {
+                    throw new ArgumentException("Callback URLs cannot be null or empty.");
+                }
+
+                // Ensure the address is a valid absolute URL.
+                if (!Uri.TryCreate(address, UriKind.Absolute, out Uri uri) || !uri.IsWellFormedOriginalString())
+                {
+                    throw new ArgumentException("Callback URLs must be valid absolute URLs.");
+                }
+
+                descriptor.RedirectUris.Add(uri);
+            }
+
             await ValidateAsync(descriptor, cancellationToken);
         }
 
@@ -665,36 +726,26 @@ namespace OpenIddict.Core
                 throw new ArgumentException("A client secret cannot be associated with a public application.", nameof(descriptor));
             }
 
-            // When a redirect_uri is specified, ensure it is valid and spec-compliant.
+            // When callback URLs are specified, ensure they are valid and spec-compliant.
             // See https://tools.ietf.org/html/rfc6749#section-3.1 for more information.
-            if (!string.IsNullOrEmpty(descriptor.RedirectUri))
+            foreach (var uri in descriptor.PostLogoutRedirectUris.Concat(descriptor.RedirectUris))
             {
-                // Ensure the redirect_uri is a valid and absolute URL.
-                if (!Uri.TryCreate(descriptor.RedirectUri, UriKind.Absolute, out Uri uri))
-                {
-                    throw new ArgumentException("The redirect_uri must be an absolute URL.");
-                }
-
-                // Ensure the redirect_uri doesn't contain a fragment.
-                if (!string.IsNullOrEmpty(uri.Fragment))
+                // Ensure the address is not null.
+                if (uri == null)
                 {
-                    throw new ArgumentException("The redirect_uri cannot contain a fragment.");
+                    throw new ArgumentException("Callback URLs cannot be null.");
                 }
-            }
 
-            // When a post_logout_redirect_uri is specified, ensure it is valid.
-            if (!string.IsNullOrEmpty(descriptor.LogoutRedirectUri))
-            {
-                // Ensure the post_logout_redirect_uri is a valid and absolute URL.
-                if (!Uri.TryCreate(descriptor.LogoutRedirectUri, UriKind.Absolute, out Uri uri))
+                // Ensure the address is a valid and absolute URL.
+                if (!uri.IsAbsoluteUri || !uri.IsWellFormedOriginalString())
                 {
-                    throw new ArgumentException("The post_logout_redirect_uri must be an absolute URL.");
+                    throw new ArgumentException("Callback URLs must be valid absolute URLs.");
                 }
 
-                // Ensure the post_logout_redirect_uri doesn't contain a fragment.
+                // Ensure the address doesn't contain a fragment.
                 if (!string.IsNullOrEmpty(uri.Fragment))
                 {
-                    throw new ArgumentException("The post_logout_redirect_uri cannot contain a fragment.");
+                    throw new ArgumentException("Callback URLs cannot contain a fragment.");
                 }
             }
 
diff --git a/src/OpenIddict.Core/Managers/OpenIddictAuthorizationManager.cs b/src/OpenIddict.Core/Managers/OpenIddictAuthorizationManager.cs
index 34f4c18f..284d7ba4 100644
--- a/src/OpenIddict.Core/Managers/OpenIddictAuthorizationManager.cs
+++ b/src/OpenIddict.Core/Managers/OpenIddictAuthorizationManager.cs
@@ -253,6 +253,20 @@ namespace OpenIddict.Core
                 throw new ArgumentException("The subject cannot be null or empty.");
             }
 
+            // Ensure that the scopes are not null or empty and do not contain spaces.
+            foreach (var scope in descriptor.Scopes)
+            {
+                if (string.IsNullOrEmpty(scope))
+                {
+                    throw new ArgumentException("Scopes cannot be null or empty.", nameof(descriptor));
+                }
+
+                if (scope.Contains(OpenIddictConstants.Separators.Space))
+                {
+                    throw new ArgumentException("Scopes cannot contain spaces.", nameof(descriptor));
+                }
+            }
+
             return Task.CompletedTask;
         }
     }
diff --git a/src/OpenIddict.Core/OpenIddictConstants.cs b/src/OpenIddict.Core/OpenIddictConstants.cs
index 0b3a02e0..4ba722e7 100644
--- a/src/OpenIddict.Core/OpenIddictConstants.cs
+++ b/src/OpenIddict.Core/OpenIddictConstants.cs
@@ -37,6 +37,11 @@ namespace OpenIddict.Core
             public const string TokenId = ".token_id";
         }
 
+        public static class Separators
+        {
+            public const string Space = " ";
+        }
+
         public static class Scopes
         {
             public const string Roles = "roles";
diff --git a/src/OpenIddict.Core/Stores/IOpenIddictApplicationStore.cs b/src/OpenIddict.Core/Stores/IOpenIddictApplicationStore.cs
index 08965a07..76de9dbe 100644
--- a/src/OpenIddict.Core/Stores/IOpenIddictApplicationStore.cs
+++ b/src/OpenIddict.Core/Stores/IOpenIddictApplicationStore.cs
@@ -58,7 +58,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the client application corresponding to the identifier.
         /// </returns>
-        Task<TApplication> FindByIdAsync(string identifier, CancellationToken cancellationToken);
+        Task<TApplication> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves an application using its client identifier.
@@ -69,7 +69,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the client application corresponding to the identifier.
         /// </returns>
-        Task<TApplication> FindByClientIdAsync(string identifier, CancellationToken cancellationToken);
+        Task<TApplication> FindByClientIdAsync([NotNull] string identifier, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves all the applications associated with the specified post_logout_redirect_uri.
@@ -80,7 +80,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns the client applications corresponding to the specified post_logout_redirect_uri.
         /// </returns>
-        Task<TApplication[]> FindByLogoutRedirectUriAsync(string address, CancellationToken cancellationToken);
+        Task<TApplication[]> FindByPostLogoutRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves all the applications associated with the specified redirect_uri.
@@ -91,7 +91,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns the client applications corresponding to the specified redirect_uri.
         /// </returns>
-        Task<TApplication[]> FindByRedirectUriAsync(string address, CancellationToken cancellationToken);
+        Task<TApplication[]> FindByRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken);
 
         /// <summary>
         /// Executes the specified query.
@@ -163,26 +163,26 @@ namespace OpenIddict.Core
         Task<string> GetIdAsync([NotNull] TApplication application, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Retrieves the logout callback address associated with an application.
+        /// Retrieves the logout callback addresses associated with an application.
         /// </summary>
         /// <param name="application">The application.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
-        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the post_logout_redirect_uri associated with the application.
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose
+        /// result returns all the post_logout_redirect_uri associated with the application.
         /// </returns>
-        Task<string> GetLogoutRedirectUriAsync([NotNull] TApplication application, CancellationToken cancellationToken);
+        Task<string[]> GetPostLogoutRedirectUrisAsync([NotNull] TApplication application, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Retrieves the callback address associated with an application.
+        /// Retrieves the callback addresses associated with an application.
         /// </summary>
         /// <param name="application">The application.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the redirect_uri associated with the application.
+        /// whose result returns all the redirect_uri associated with the application.
         /// </returns>
-        Task<string> GetRedirectUriAsync([NotNull] TApplication application, CancellationToken cancellationToken);
+        Task<string[]> GetRedirectUrisAsync([NotNull] TApplication application, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves the token identifiers associated with an application.
@@ -231,6 +231,30 @@ namespace OpenIddict.Core
         /// </returns>
         Task SetClientTypeAsync([NotNull] TApplication application, [NotNull] string type, CancellationToken cancellationToken);
 
+        /// <summary>
+        /// Sets the logout callback addresses associated with an application.
+        /// </summary>
+        /// <param name="application">The application.</param>
+        /// <param name="addresses">The logout callback addresses associated with the application </param>
+        /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
+        /// <returns>
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation.
+        /// </returns>
+        Task SetPostLogoutRedirectUrisAsync([NotNull] TApplication application,
+            [NotNull] string[] addresses, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Sets the callback addresses associated with an application.
+        /// </summary>
+        /// <param name="application">The application.</param>
+        /// <param name="addresses">The callback addresses associated with the application </param>
+        /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
+        /// <returns>
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation.
+        /// </returns>
+        Task SetRedirectUrisAsync([NotNull] TApplication application,
+            [NotNull] string[] addresses, CancellationToken cancellationToken);
+
         /// <summary>
         /// Updates an existing application.
         /// </summary>
diff --git a/src/OpenIddict.Core/Stores/IOpenIddictAuthorizationStore.cs b/src/OpenIddict.Core/Stores/IOpenIddictAuthorizationStore.cs
index aaf3c41f..44b6b506 100644
--- a/src/OpenIddict.Core/Stores/IOpenIddictAuthorizationStore.cs
+++ b/src/OpenIddict.Core/Stores/IOpenIddictAuthorizationStore.cs
@@ -39,27 +39,27 @@ namespace OpenIddict.Core
         Task<TAuthorization> CreateAsync([NotNull] OpenIddictAuthorizationDescriptor descriptor, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Retrieves an authorization using its unique identifier.
+        /// Retrieves an authorization using its associated subject/client.
         /// </summary>
-        /// <param name="identifier">The unique identifier associated with the authorization.</param>
+        /// <param name="subject">The subject associated with the authorization.</param>
+        /// <param name="client">The client associated with the authorization.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the authorization corresponding to the identifier.
+        /// whose result returns the authorization corresponding to the subject/client.
         /// </returns>
-        Task<TAuthorization> FindByIdAsync(string identifier, CancellationToken cancellationToken);
+        Task<TAuthorization> FindAsync([NotNull] string subject, [NotNull] string client, CancellationToken cancellationToken);
 
         /// <summary>
-        /// Retrieves an authorization using its associated subject/client.
+        /// Retrieves an authorization using its unique identifier.
         /// </summary>
-        /// <param name="subject">The subject associated with the authorization.</param>
-        /// <param name="client">The client associated with the authorization.</param>
+        /// <param name="identifier">The unique identifier associated with the authorization.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the authorization corresponding to the subject/client.
+        /// whose result returns the authorization corresponding to the identifier.
         /// </returns>
-        Task<TAuthorization> FindAsync(string subject, string client, CancellationToken cancellationToken);
+        Task<TAuthorization> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken);
 
         /// <summary>
         /// Executes the specified query.
diff --git a/src/OpenIddict.Core/Stores/IOpenIddictTokenStore.cs b/src/OpenIddict.Core/Stores/IOpenIddictTokenStore.cs
index 97512467..db25f7e5 100644
--- a/src/OpenIddict.Core/Stores/IOpenIddictTokenStore.cs
+++ b/src/OpenIddict.Core/Stores/IOpenIddictTokenStore.cs
@@ -55,7 +55,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the tokens corresponding to the specified authorization.
         /// </returns>
-        Task<TToken[]> FindByAuthorizationIdAsync(string identifier, CancellationToken cancellationToken);
+        Task<TToken[]> FindByAuthorizationIdAsync([NotNull] string identifier, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves the list of tokens corresponding to the specified hash.
@@ -66,7 +66,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the tokens corresponding to the specified hash.
         /// </returns>
-        Task<TToken> FindByHashAsync(string hash, CancellationToken cancellationToken);
+        Task<TToken> FindByHashAsync([NotNull] string hash, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves an token using its unique identifier.
@@ -77,7 +77,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the token corresponding to the unique identifier.
         /// </returns>
-        Task<TToken> FindByIdAsync(string identifier, CancellationToken cancellationToken);
+        Task<TToken> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken);
 
         /// <summary>
         /// Retrieves the list of tokens corresponding to the specified subject.
@@ -88,7 +88,7 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the tokens corresponding to the specified subject.
         /// </returns>
-        Task<TToken[]> FindBySubjectAsync(string subject, CancellationToken cancellationToken);
+        Task<TToken[]> FindBySubjectAsync([NotNull] string subject, CancellationToken cancellationToken);
 
         /// <summary>
         /// Executes the specified query.
diff --git a/src/OpenIddict.Core/Stores/OpenIddictApplicationStore.cs b/src/OpenIddict.Core/Stores/OpenIddictApplicationStore.cs
index 80dcaf0f..bec50e1f 100644
--- a/src/OpenIddict.Core/Stores/OpenIddictApplicationStore.cs
+++ b/src/OpenIddict.Core/Stores/OpenIddictApplicationStore.cs
@@ -10,6 +10,7 @@ using System.ComponentModel;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using AspNet.Security.OpenIdConnect.Primitives;
 using JetBrains.Annotations;
 using OpenIddict.Models;
 
@@ -68,8 +69,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the client application corresponding to the identifier.
         /// </returns>
-        public virtual Task<TApplication> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public virtual Task<TApplication> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             var key = ConvertIdentifierFromString(identifier);
 
             return GetAsync(applications => applications.Where(application => application.Id.Equals(key)), cancellationToken);
@@ -84,8 +90,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the client application corresponding to the identifier.
         /// </returns>
-        public virtual Task<TApplication> FindByClientIdAsync(string identifier, CancellationToken cancellationToken)
+        public virtual Task<TApplication> FindByClientIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return GetAsync(applications => applications.Where(application => application.ClientId.Equals(identifier)), cancellationToken);
         }
 
@@ -98,9 +109,60 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns the client applications corresponding to the specified post_logout_redirect_uri.
         /// </returns>
-        public virtual Task<TApplication[]> FindByLogoutRedirectUriAsync(string address, CancellationToken cancellationToken)
+        public virtual async Task<TApplication[]> FindByPostLogoutRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken)
         {
-            return ListAsync(applications => applications.Where(application => application.LogoutRedirectUri == address), cancellationToken);
+            if (string.IsNullOrEmpty(address))
+            {
+                throw new ArgumentException("The address cannot be null or empty.", nameof(address));
+            }
+
+            // To optimize the efficiency of the query, only the applications whose stringified
+            // LogoutRedirectUris property contains the specified address are returned. Once the
+            // applications are retrieved, the LogoutRedirectUri property is manually split.
+            var candidates = await ListAsync(applications => applications.Where(application =>
+                application.PostLogoutRedirectUris.Contains(address)), cancellationToken);
+
+            if (candidates.Length == 0)
+            {
+                return Array.Empty<TApplication>();
+            }
+
+            // Optimization: to save an allocation when no application matches
+            // the specified address, the results list is lazily initialized
+            // when at least one matching application was found in the database.
+            List<TApplication> results = null;
+
+            foreach (var candidate in candidates)
+            {
+                var uris = candidate.PostLogoutRedirectUris?.Split(
+                    OpenIdConnectConstants.Separators.Space,
+                    StringSplitOptions.RemoveEmptyEntries);
+
+                if (uris == null)
+                {
+                    continue;
+                }
+
+                foreach (var uri in uris)
+                {
+                    // Note: the post_logout_redirect_uri must be compared
+                    // using case-sensitive "Simple String Comparison".
+                    if (!string.Equals(uri, address, StringComparison.Ordinal))
+                    {
+                        continue;
+                    }
+
+                    // Ensure the results list was initialized before using it.
+                    if (results == null)
+                    {
+                        results = new List<TApplication>(capacity: 1);
+                    }
+
+                    results.Add(candidate);
+                }
+            }
+
+            return results?.ToArray() ?? Array.Empty<TApplication>();
         }
 
         /// <summary>
@@ -112,9 +174,60 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose result
         /// returns the client applications corresponding to the specified redirect_uri.
         /// </returns>
-        public virtual Task<TApplication[]> FindByRedirectUriAsync(string address, CancellationToken cancellationToken)
+        public virtual async Task<TApplication[]> FindByRedirectUriAsync([NotNull] string address, CancellationToken cancellationToken)
         {
-            return ListAsync(applications => applications.Where(application => application.RedirectUri == address), cancellationToken);
+            if (string.IsNullOrEmpty(address))
+            {
+                throw new ArgumentException("The address cannot be null or empty.", nameof(address));
+            }
+
+            // To optimize the efficiency of the query, only the applications whose stringified
+            // RedirectUris property contains the specified address are returned. Once the
+            // applications are retrieved, the RedirectUri property is manually split.
+            var candidates = await ListAsync(applications => applications.Where(application =>
+                application.RedirectUris.Contains(address)), cancellationToken);
+
+            if (candidates.Length == 0)
+            {
+                return Array.Empty<TApplication>();
+            }
+
+            // Optimization: to save an allocation when no application matches
+            // the specified address, the results list is lazily initialized
+            // when at least one matching application was found in the database.
+            List<TApplication> results = null;
+
+            foreach (var candidate in candidates)
+            {
+                var uris = candidate.RedirectUris?.Split(
+                    OpenIdConnectConstants.Separators.Space,
+                    StringSplitOptions.RemoveEmptyEntries);
+
+                if (uris == null)
+                {
+                    continue;
+                }
+
+                foreach (var uri in uris)
+                {
+                    // Note: the redirect_uri must be compared using case-sensitive "Simple String Comparison".
+                    // See http://openid.net/specs/openid-connect-core-1_0.html#AuthRequest for more information.
+                    if (!string.Equals(uri, address, StringComparison.Ordinal))
+                    {
+                        continue;
+                    }
+
+                    // Ensure the results list was initialized before using it.
+                    if (results == null)
+                    {
+                        results = new List<TApplication>(capacity: 1);
+                    }
+
+                    results.Add(candidate);
+                }
+            }
+
+            return results?.ToArray() ?? Array.Empty<TApplication>();
         }
 
         /// <summary>
@@ -227,41 +340,55 @@ namespace OpenIddict.Core
         }
 
         /// <summary>
-        /// Retrieves the logout callback address associated with an application.
+        /// Retrieves the logout callback addresses associated with an application.
         /// </summary>
         /// <param name="application">The application.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
-        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the post_logout_redirect_uri associated with the application.
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation, whose
+        /// result returns all the post_logout_redirect_uri associated with the application.
         /// </returns>
-        public virtual Task<string> GetLogoutRedirectUriAsync([NotNull] TApplication application, CancellationToken cancellationToken)
+        public virtual Task<string[]> GetPostLogoutRedirectUrisAsync([NotNull] TApplication application, CancellationToken cancellationToken)
         {
             if (application == null)
             {
                 throw new ArgumentNullException(nameof(application));
             }
 
-            return Task.FromResult(application.LogoutRedirectUri);
+            if (string.IsNullOrEmpty(application.PostLogoutRedirectUris))
+            {
+                return Task.FromResult(Array.Empty<string>());
+            }
+
+            return Task.FromResult(application.PostLogoutRedirectUris.Split(
+                OpenIdConnectConstants.Separators.Space,
+                StringSplitOptions.RemoveEmptyEntries));
         }
 
         /// <summary>
-        /// Retrieves the callback address associated with an application.
+        /// Retrieves the callback addresses associated with an application.
         /// </summary>
         /// <param name="application">The application.</param>
         /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
         /// <returns>
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
-        /// whose result returns the redirect_uri associated with the application.
+        /// whose result returns all the redirect_uri associated with the application.
         /// </returns>
-        public virtual Task<string> GetRedirectUriAsync([NotNull] TApplication application, CancellationToken cancellationToken)
+        public virtual Task<string[]> GetRedirectUrisAsync([NotNull] TApplication application, CancellationToken cancellationToken)
         {
             if (application == null)
             {
                 throw new ArgumentNullException(nameof(application));
             }
 
-            return Task.FromResult(application.RedirectUri);
+            if (string.IsNullOrEmpty(application.RedirectUris))
+            {
+                return Task.FromResult(Array.Empty<string>());
+            }
+
+            return Task.FromResult(application.RedirectUris.Split(
+                OpenIdConnectConstants.Separators.Space,
+                StringSplitOptions.RemoveEmptyEntries));
         }
 
         /// <summary>
@@ -327,7 +454,7 @@ namespace OpenIddict.Core
 
             application.ClientSecret = secret;
 
-            return Task.FromResult(0);
+            return Task.CompletedTask;
         }
 
         /// <summary>
@@ -353,7 +480,81 @@ namespace OpenIddict.Core
 
             application.Type = type;
 
-            return Task.FromResult(0);
+            return Task.CompletedTask;
+        }
+
+        /// <summary>
+        /// Sets the logout callback addresses associated with an application.
+        /// </summary>
+        /// <param name="application">The application.</param>
+        /// <param name="addresses">The logout callback addresses associated with the application </param>
+        /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
+        /// <returns>
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation.
+        /// </returns>
+        public virtual Task SetPostLogoutRedirectUrisAsync([NotNull] TApplication application,
+            [NotNull] string[] addresses, CancellationToken cancellationToken)
+        {
+            if (application == null)
+            {
+                throw new ArgumentException(nameof(application));
+            }
+
+            if (addresses == null)
+            {
+                throw new ArgumentException(nameof(addresses));
+            }
+
+            if (addresses.Any(address => string.IsNullOrEmpty(address)))
+            {
+                throw new ArgumentException("Callback addresses cannot be null or empty.", nameof(addresses));
+            }
+
+            if (addresses.Any(address => address.Contains(OpenIddictConstants.Separators.Space)))
+            {
+                throw new ArgumentException("Callback addresses cannot contain spaces.", nameof(addresses));
+            }
+
+            application.PostLogoutRedirectUris = string.Join(OpenIddictConstants.Separators.Space, addresses);
+
+            return Task.CompletedTask;
+        }
+
+        /// <summary>
+        /// Sets the callback addresses associated with an application.
+        /// </summary>
+        /// <param name="application">The application.</param>
+        /// <param name="addresses">The callback addresses associated with the application </param>
+        /// <param name="cancellationToken">The <see cref="CancellationToken"/> that can be used to abort the operation.</param>
+        /// <returns>
+        /// A <see cref="Task"/> that can be used to monitor the asynchronous operation.
+        /// </returns>
+        public virtual Task SetRedirectUrisAsync([NotNull] TApplication application,
+            [NotNull] string[] addresses, CancellationToken cancellationToken)
+        {
+            if (application == null)
+            {
+                throw new ArgumentException(nameof(application));
+            }
+
+            if (addresses == null)
+            {
+                throw new ArgumentException(nameof(addresses));
+            }
+
+            if (addresses.Any(address => string.IsNullOrEmpty(address)))
+            {
+                throw new ArgumentException("Callback addresses cannot be null or empty.", nameof(addresses));
+            }
+
+            if (addresses.Any(address => address.Contains(OpenIddictConstants.Separators.Space)))
+            {
+                throw new ArgumentException("Callback addresses cannot contain spaces.", nameof(addresses));
+            }
+
+            application.RedirectUris = string.Join(OpenIddictConstants.Separators.Space, addresses);
+
+            return Task.CompletedTask;
         }
 
         /// <summary>
diff --git a/src/OpenIddict.Core/Stores/OpenIddictAuthorizationStore.cs b/src/OpenIddict.Core/Stores/OpenIddictAuthorizationStore.cs
index 4d158503..75a1bc80 100644
--- a/src/OpenIddict.Core/Stores/OpenIddictAuthorizationStore.cs
+++ b/src/OpenIddict.Core/Stores/OpenIddictAuthorizationStore.cs
@@ -58,8 +58,18 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the authorization corresponding to the subject/client.
         /// </returns>
-        public virtual Task<TAuthorization> FindAsync(string subject, string client, CancellationToken cancellationToken)
+        public virtual Task<TAuthorization> FindAsync([NotNull] string subject, [NotNull] string client, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(subject))
+            {
+                throw new ArgumentException("The subject cannot be null or empty.", nameof(subject));
+            }
+
+            if (string.IsNullOrEmpty(client))
+            {
+                throw new ArgumentException("The client cannot be null or empty.", nameof(client));
+            }
+
             var key = ConvertIdentifierFromString(client);
 
             return GetAsync(authorizations =>
@@ -78,8 +88,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the authorization corresponding to the identifier.
         /// </returns>
-        public virtual Task<TAuthorization> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public virtual Task<TAuthorization> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             var key = ConvertIdentifierFromString(identifier);
 
             return GetAsync(authorizations => authorizations.Where(authorization => authorization.Id.Equals(key)), cancellationToken);
diff --git a/src/OpenIddict.Core/Stores/OpenIddictTokenStore.cs b/src/OpenIddict.Core/Stores/OpenIddictTokenStore.cs
index 12a2cda0..d98fafdf 100644
--- a/src/OpenIddict.Core/Stores/OpenIddictTokenStore.cs
+++ b/src/OpenIddict.Core/Stores/OpenIddictTokenStore.cs
@@ -65,8 +65,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the tokens corresponding to the specified authorization.
         /// </returns>
-        public virtual Task<TToken[]> FindByAuthorizationIdAsync(string identifier, CancellationToken cancellationToken)
+        public virtual Task<TToken[]> FindByAuthorizationIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             var key = ConvertIdentifierFromString(identifier);
 
             return ListAsync(tokens => tokens.Where(token => token.Authorization.Id.Equals(key)), cancellationToken);
@@ -81,8 +86,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the tokens corresponding to the specified hash.
         /// </returns>
-        public virtual Task<TToken> FindByHashAsync(string hash, CancellationToken cancellationToken)
+        public virtual Task<TToken> FindByHashAsync([NotNull] string hash, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(hash))
+            {
+                throw new ArgumentException("The hash cannot be null or empty.", nameof(hash));
+            }
+
             return GetAsync(tokens => tokens.Where(token => token.Hash == hash), cancellationToken);
         }
 
@@ -95,8 +105,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the token corresponding to the unique identifier.
         /// </returns>
-        public virtual Task<TToken> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public virtual Task<TToken> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             var key = ConvertIdentifierFromString(identifier);
 
             return GetAsync(tokens => tokens.Where(token => token.Id.Equals(key)), cancellationToken);
@@ -111,8 +126,13 @@ namespace OpenIddict.Core
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the tokens corresponding to the specified subject.
         /// </returns>
-        public virtual Task<TToken[]> FindBySubjectAsync(string subject, CancellationToken cancellationToken)
+        public virtual Task<TToken[]> FindBySubjectAsync([NotNull] string subject, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(subject))
+            {
+                throw new ArgumentException("The subject cannot be null or empty.", nameof(subject));
+            }
+
             return ListAsync(tokens => tokens.Where(token => token.Subject == subject), cancellationToken);
         }
 
diff --git a/src/OpenIddict.EntityFramework/Stores/OpenIddictApplicationStore.cs b/src/OpenIddict.EntityFramework/Stores/OpenIddictApplicationStore.cs
index 5330656f..52cc69b4 100644
--- a/src/OpenIddict.EntityFramework/Stores/OpenIddictApplicationStore.cs
+++ b/src/OpenIddict.EntityFramework/Stores/OpenIddictApplicationStore.cs
@@ -123,11 +123,23 @@ namespace OpenIddict.EntityFramework
                 ClientId = descriptor.ClientId,
                 ClientSecret = descriptor.ClientSecret,
                 DisplayName = descriptor.DisplayName,
-                LogoutRedirectUri = descriptor.LogoutRedirectUri,
-                RedirectUri = descriptor.RedirectUri,
                 Type = descriptor.Type
             };
 
+            if (descriptor.PostLogoutRedirectUris.Count != 0)
+            {
+                application.PostLogoutRedirectUris = string.Join(
+                    OpenIddictConstants.Separators.Space,
+                    descriptor.PostLogoutRedirectUris.Select(uri => uri.OriginalString));
+            }
+
+            if (descriptor.RedirectUris.Count != 0)
+            {
+                application.RedirectUris = string.Join(
+                    OpenIddictConstants.Separators.Space,
+                    descriptor.RedirectUris.Select(uri => uri.OriginalString));
+            }
+
             return CreateAsync(application, cancellationToken);
         }
 
@@ -165,8 +177,13 @@ namespace OpenIddict.EntityFramework
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the client application corresponding to the identifier.
         /// </returns>
-        public override Task<TApplication> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public override Task<TApplication> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return Applications.FindAsync(cancellationToken, ConvertIdentifierFromString(identifier));
         }
 
diff --git a/src/OpenIddict.EntityFramework/Stores/OpenIddictAuthorizationStore.cs b/src/OpenIddict.EntityFramework/Stores/OpenIddictAuthorizationStore.cs
index deb68fbe..217bfeed 100644
--- a/src/OpenIddict.EntityFramework/Stores/OpenIddictAuthorizationStore.cs
+++ b/src/OpenIddict.EntityFramework/Stores/OpenIddictAuthorizationStore.cs
@@ -125,11 +125,15 @@ namespace OpenIddict.EntityFramework
 
             var authorization = new TAuthorization
             {
-                Scope = string.Join(" ", descriptor.Scopes),
                 Status = descriptor.Status,
                 Subject = descriptor.Subject
             };
 
+            if (descriptor.Scopes.Count != 0)
+            {
+                authorization.Scopes = string.Join(OpenIddictConstants.Separators.Space, descriptor.Scopes);
+            }
+
             // Bind the authorization to the specified application, if applicable.
             if (!string.IsNullOrEmpty(descriptor.ApplicationId))
             {
@@ -154,8 +158,13 @@ namespace OpenIddict.EntityFramework
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the authorization corresponding to the identifier.
         /// </returns>
-        public override Task<TAuthorization> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public override Task<TAuthorization> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return Authorizations.FindAsync(cancellationToken, ConvertIdentifierFromString(identifier));
         }
 
diff --git a/src/OpenIddict.EntityFramework/Stores/OpenIddictTokenStore.cs b/src/OpenIddict.EntityFramework/Stores/OpenIddictTokenStore.cs
index e3817327..1987e46e 100644
--- a/src/OpenIddict.EntityFramework/Stores/OpenIddictTokenStore.cs
+++ b/src/OpenIddict.EntityFramework/Stores/OpenIddictTokenStore.cs
@@ -198,8 +198,13 @@ namespace OpenIddict.EntityFramework
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the token corresponding to the unique identifier.
         /// </returns>
-        public override Task<TToken> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public override Task<TToken> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return Tokens.FindAsync(cancellationToken, ConvertIdentifierFromString(identifier));
         }
 
diff --git a/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictApplicationStore.cs b/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictApplicationStore.cs
index c33728a2..d2ebeaf3 100644
--- a/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictApplicationStore.cs
+++ b/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictApplicationStore.cs
@@ -122,11 +122,23 @@ namespace OpenIddict.EntityFrameworkCore
                 ClientId = descriptor.ClientId,
                 ClientSecret = descriptor.ClientSecret,
                 DisplayName = descriptor.DisplayName,
-                LogoutRedirectUri = descriptor.LogoutRedirectUri,
-                RedirectUri = descriptor.RedirectUri,
                 Type = descriptor.Type
             };
 
+            if (descriptor.PostLogoutRedirectUris.Count != 0)
+            {
+                application.PostLogoutRedirectUris = string.Join(
+                    OpenIddictConstants.Separators.Space,
+                    descriptor.PostLogoutRedirectUris.Select(uri => uri.OriginalString));
+            }
+
+            if (descriptor.RedirectUris.Count != 0)
+            {
+                application.RedirectUris = string.Join(
+                    OpenIddictConstants.Separators.Space,
+                    descriptor.RedirectUris.Select(uri => uri.OriginalString));
+            }
+
             return CreateAsync(application, cancellationToken);
         }
 
@@ -164,8 +176,13 @@ namespace OpenIddict.EntityFrameworkCore
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the client application corresponding to the identifier.
         /// </returns>
-        public override Task<TApplication> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public override Task<TApplication> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return Applications.FindAsync(new object[] { ConvertIdentifierFromString(identifier) }, cancellationToken);
         }
 
diff --git a/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictAuthorizationStore.cs b/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictAuthorizationStore.cs
index 6acea907..35351fa2 100644
--- a/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictAuthorizationStore.cs
+++ b/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictAuthorizationStore.cs
@@ -124,11 +124,15 @@ namespace OpenIddict.EntityFrameworkCore
 
             var authorization = new TAuthorization
             {
-                Scope = string.Join(" ", descriptor.Scopes),
                 Status = descriptor.Status,
                 Subject = descriptor.Subject
             };
 
+            if (descriptor.Scopes.Count != 0)
+            {
+                authorization.Scopes = string.Join(OpenIddictConstants.Separators.Space, descriptor.Scopes);
+            }
+
             // Bind the authorization to the specified application, if applicable.
             if (!string.IsNullOrEmpty(descriptor.ApplicationId))
             {
@@ -153,8 +157,13 @@ namespace OpenIddict.EntityFrameworkCore
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the authorization corresponding to the identifier.
         /// </returns>
-        public override Task<TAuthorization> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public override Task<TAuthorization> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return Authorizations.FindAsync(new object[] { ConvertIdentifierFromString(identifier) }, cancellationToken);
         }
 
diff --git a/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictTokenStore.cs b/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictTokenStore.cs
index 34c593f4..3dc76866 100644
--- a/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictTokenStore.cs
+++ b/src/OpenIddict.EntityFrameworkCore/Stores/OpenIddictTokenStore.cs
@@ -197,8 +197,13 @@ namespace OpenIddict.EntityFrameworkCore
         /// A <see cref="Task"/> that can be used to monitor the asynchronous operation,
         /// whose result returns the token corresponding to the unique identifier.
         /// </returns>
-        public override Task<TToken> FindByIdAsync(string identifier, CancellationToken cancellationToken)
+        public override Task<TToken> FindByIdAsync([NotNull] string identifier, CancellationToken cancellationToken)
         {
+            if (string.IsNullOrEmpty(identifier))
+            {
+                throw new ArgumentException("The identifier cannot be null or empty.", nameof(identifier));
+            }
+
             return Tokens.FindAsync(new object[] { ConvertIdentifierFromString(identifier) }, cancellationToken);
         }
 
diff --git a/src/OpenIddict.Models/OpenIddictApplication.cs b/src/OpenIddict.Models/OpenIddictApplication.cs
index 120ac6ef..4ddea077 100644
--- a/src/OpenIddict.Models/OpenIddictApplication.cs
+++ b/src/OpenIddict.Models/OpenIddictApplication.cs
@@ -64,16 +64,18 @@ namespace OpenIddict.Models
         public virtual TKey Id { get; set; }
 
         /// <summary>
-        /// Gets or sets the logout callback URL
-        /// associated with the current application.
+        /// Gets or sets the logout callback URLs
+        /// associated with the current application,
+        /// stored as a unique space-separated string.
         /// </summary>
-        public virtual string LogoutRedirectUri { get; set; }
+        public virtual string PostLogoutRedirectUris { get; set; }
 
         /// <summary>
-        /// Gets or sets the callback URL
-        /// associated with the current application.
+        /// Gets or sets the callback URLs
+        /// associated with the current application,
+        /// stored as a unique space-separated string.
         /// </summary>
-        public virtual string RedirectUri { get; set; }
+        public virtual string RedirectUris { get; set; }
 
         /// <summary>
         /// Gets the list of the tokens associated with this application.
diff --git a/src/OpenIddict.Models/OpenIddictAuthorization.cs b/src/OpenIddict.Models/OpenIddictAuthorization.cs
index 2ff98b8e..5ec20cd3 100644
--- a/src/OpenIddict.Models/OpenIddictAuthorization.cs
+++ b/src/OpenIddict.Models/OpenIddictAuthorization.cs
@@ -48,7 +48,7 @@ namespace OpenIddict.Models
         /// Gets or sets the space-delimited scopes
         /// associated with the current authorization.
         /// </summary>
-        public virtual string Scope { get; set; }
+        public virtual string Scopes { get; set; }
 
         /// <summary>
         /// Gets or sets the status of the current authorization.
diff --git a/src/OpenIddict/OpenIddictProvider.Authentication.cs b/src/OpenIddict/OpenIddictProvider.Authentication.cs
index 9a147728..1b4f6da9 100644
--- a/src/OpenIddict/OpenIddictProvider.Authentication.cs
+++ b/src/OpenIddict/OpenIddictProvider.Authentication.cs
@@ -260,33 +260,20 @@ namespace OpenIddict
                                 "application was not found: '{ClientId}'.", context.ClientId);
 
                 context.Reject(
-                    error: OpenIdConnectConstants.Errors.InvalidClient,
+                    error: OpenIdConnectConstants.Errors.InvalidRequest,
                     description: "Application not found in the database: ensure that your client_id is correct.");
 
                 return;
             }
 
-            // Ensure a redirect_uri was associated with the application.
-            if (!await Applications.HasRedirectUriAsync(application, context.HttpContext.RequestAborted))
-            {
-                Logger.LogError("The authorization request was rejected because no redirect_uri " +
-                                "was registered with the application '{ClientId}'.", context.ClientId);
-
-                context.Reject(
-                    error: OpenIdConnectConstants.Errors.UnauthorizedClient,
-                    description: "The client application is not allowed to use interactive flows.");
-
-                return;
-            }
-
-            // Ensure the redirect_uri is valid.
+            // Ensure that the specified redirect_uri is valid and is associated with the client application.
             if (!await Applications.ValidateRedirectUriAsync(application, context.RedirectUri, context.HttpContext.RequestAborted))
             {
                 Logger.LogError("The authorization request was rejected because the redirect_uri " +
                                 "was invalid: '{RedirectUri}'.", context.RedirectUri);
 
                 context.Reject(
-                    error: OpenIdConnectConstants.Errors.InvalidClient,
+                    error: OpenIdConnectConstants.Errors.InvalidRequest,
                     description: "Invalid redirect_uri.");
 
                 return;
diff --git a/src/OpenIddict/OpenIddictProvider.Serialization.cs b/src/OpenIddict/OpenIddictProvider.Serialization.cs
index 60e7ba89..da335e25 100644
--- a/src/OpenIddict/OpenIddictProvider.Serialization.cs
+++ b/src/OpenIddict/OpenIddictProvider.Serialization.cs
@@ -256,14 +256,7 @@ namespace OpenIddict
             {
                 Debug.Assert(!string.IsNullOrEmpty(descriptor.ApplicationId), "The client identifier shouldn't be null.");
 
-                var authorization = await Authorizations.CreateAsync(new OpenIddictAuthorizationDescriptor
-                {
-                    ApplicationId = descriptor.ApplicationId,
-                    Scopes = request.GetScopes(),
-                    Status = OpenIddictConstants.Statuses.Valid,
-                    Subject = descriptor.Subject
-                }, context.RequestAborted);
-
+                var authorization = await CreateAuthorizationAsync(descriptor, context, request);
                 if (authorization != null)
                 {
                     descriptor.AuthorizationId = await Authorizations.GetIdAsync(authorization, context.RequestAborted);
@@ -399,5 +392,24 @@ namespace OpenIddict
 
             return ticket;
         }
+
+        private Task<TAuthorization> CreateAuthorizationAsync(
+            [NotNull] OpenIddictTokenDescriptor token,
+            [NotNull] HttpContext context, [NotNull] OpenIdConnectRequest request)
+        {
+            var descriptor = new OpenIddictAuthorizationDescriptor
+            {
+                ApplicationId = token.ApplicationId,
+                Status = OpenIddictConstants.Statuses.Valid,
+                Subject = token.Subject
+            };
+
+            foreach (var scope in request.GetScopes())
+            {
+                descriptor.Scopes.Add(scope);
+            }
+
+            return Authorizations.CreateAsync(descriptor, context.RequestAborted);
+        }
     }
 }
\ No newline at end of file
diff --git a/src/OpenIddict/OpenIddictProvider.Session.cs b/src/OpenIddict/OpenIddictProvider.Session.cs
index 66066bdb..b920828d 100644
--- a/src/OpenIddict/OpenIddictProvider.Session.cs
+++ b/src/OpenIddict/OpenIddictProvider.Session.cs
@@ -82,17 +82,43 @@ namespace OpenIddict
         public override async Task ValidateLogoutRequest([NotNull] ValidateLogoutRequestContext context)
         {
             // If an optional post_logout_redirect_uri was provided, validate it.
-            if (!string.IsNullOrEmpty(context.PostLogoutRedirectUri) &&
-                !await Applications.ValidateLogoutRedirectUriAsync(context.PostLogoutRedirectUri, context.HttpContext.RequestAborted))
+            if (!string.IsNullOrEmpty(context.PostLogoutRedirectUri))
             {
-                Logger.LogError("The logout request was rejected because the specified post_logout_redirect_uri " +
-                                "was invalid: '{PostLogoutRedirectUri}'.", context.PostLogoutRedirectUri);
+                if (!Uri.TryCreate(context.PostLogoutRedirectUri, UriKind.Absolute, out Uri uri) || !uri.IsWellFormedOriginalString())
+                {
+                    Logger.LogError("The logout request was rejected because the specified post_logout_redirect_uri was not " +
+                                    "a valid absolute URL: {PostLogoutRedirectUri}.", context.PostLogoutRedirectUri);
 
-                context.Reject(
-                    error: OpenIdConnectConstants.Errors.InvalidClient,
-                    description: "Invalid post_logout_redirect_uri.");
+                    context.Reject(
+                        error: OpenIdConnectConstants.Errors.InvalidRequest,
+                        description: "The 'post_logout_redirect_uri' parameter must be a valid absolute URL.");
 
-                return;
+                    return;
+                }
+
+                if (!string.IsNullOrEmpty(uri.Fragment))
+                {
+                    Logger.LogError("The logout request was rejected because the 'post_logout_redirect_uri' contained " +
+                                    "a URL fragment: {PostLogoutRedirectUri}.", context.PostLogoutRedirectUri);
+
+                    context.Reject(
+                        error: OpenIdConnectConstants.Errors.InvalidRequest,
+                        description: "The 'post_logout_redirect_uri' parameter must not include a fragment.");
+
+                    return;
+                }
+
+                if (!await Applications.ValidatePostLogoutRedirectUriAsync(context.PostLogoutRedirectUri, context.HttpContext.RequestAborted))
+                {
+                    Logger.LogError("The logout request was rejected because the specified post_logout_redirect_uri " +
+                                    "was unknown: {PostLogoutRedirectUri}.", context.PostLogoutRedirectUri);
+
+                    context.Reject(
+                        error: OpenIdConnectConstants.Errors.InvalidRequest,
+                        description: "Invalid post_logout_redirect_uri.");
+
+                    return;
+                }
             }
 
             context.Validate();
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs
index 5657820c..21d2b4b0 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Authentication.cs
@@ -337,50 +337,12 @@ namespace OpenIddict.Tests
             });
 
             // Assert
-            Assert.Equal(OpenIdConnectConstants.Errors.InvalidClient, response.Error);
+            Assert.Equal(OpenIdConnectConstants.Errors.InvalidRequest, response.Error);
             Assert.Equal("Application not found in the database: ensure that your client_id is correct.", response.ErrorDescription);
 
             Mock.Get(manager).Verify(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()), Times.Once());
         }
 
-        [Fact]
-        public async Task ValidateAuthorizationRequest_RequestIsRejectedWhenClientHasNoRedirectUri()
-        {
-            // Arrange
-            var application = new OpenIddictApplication();
-
-            var manager = CreateApplicationManager(instance =>
-            {
-                instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
-                    .ReturnsAsync(application);
-
-                instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                    .ReturnsAsync(false);
-            });
-
-            var server = CreateAuthorizationServer(builder =>
-            {
-                builder.Services.AddSingleton(manager);
-            });
-
-            var client = new OpenIdConnectClient(server.CreateClient());
-
-            // Act
-            var response = await client.PostAsync(AuthorizationEndpoint, new OpenIdConnectRequest
-            {
-                ClientId = "Fabrikam",
-                RedirectUri = "http://www.fabrikam.com/path",
-                ResponseType = OpenIdConnectConstants.ResponseTypes.Code
-            });
-
-            // Assert
-            Assert.Equal(OpenIdConnectConstants.Errors.UnauthorizedClient, response.Error);
-            Assert.Equal("The client application is not allowed to use interactive flows.", response.ErrorDescription);
-
-            Mock.Get(manager).Verify(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()), Times.Once());
-            Mock.Get(manager).Verify(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()), Times.Once());
-        }
-
         [Fact]
         public async Task ValidateAuthorizationRequest_RequestIsRejectedWhenRedirectUriIsInvalid()
         {
@@ -392,9 +354,6 @@ namespace OpenIddict.Tests
                 instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                     .ReturnsAsync(application);
 
-                instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                    .ReturnsAsync(true);
-
                 instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                     .ReturnsAsync(false);
             });
@@ -415,11 +374,10 @@ namespace OpenIddict.Tests
             });
 
             // Assert
-            Assert.Equal(OpenIdConnectConstants.Errors.InvalidClient, response.Error);
+            Assert.Equal(OpenIdConnectConstants.Errors.InvalidRequest, response.Error);
             Assert.Equal("Invalid redirect_uri.", response.ErrorDescription);
 
             Mock.Get(manager).Verify(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()), Times.Once());
-            Mock.Get(manager).Verify(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()), Times.Once());
             Mock.Get(manager).Verify(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()), Times.Once());
         }
 
@@ -439,9 +397,6 @@ namespace OpenIddict.Tests
                 instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                     .ReturnsAsync(application);
 
-                instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                    .ReturnsAsync(true);
-
                 instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                     .ReturnsAsync(true);
 
@@ -471,7 +426,6 @@ namespace OpenIddict.Tests
             Assert.Equal("Confidential clients are not allowed to retrieve a token from the authorization endpoint.", response.ErrorDescription);
 
             Mock.Get(manager).Verify(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()), Times.Once());
-            Mock.Get(manager).Verify(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()), Times.Once());
             Mock.Get(manager).Verify(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()), Times.Once());
             Mock.Get(manager).Verify(mock => mock.GetClientTypeAsync(application, It.IsAny<CancellationToken>()), Times.Once());
         }
@@ -491,9 +445,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -549,9 +500,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -628,9 +576,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -672,9 +617,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs
index 7396e477..0179b014 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Serialization.cs
@@ -237,9 +237,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -300,9 +297,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -374,9 +368,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -446,9 +437,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -507,9 +495,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
@@ -573,9 +558,6 @@ namespace OpenIddict.Tests
                     instance.Setup(mock => mock.FindByClientIdAsync("Fabrikam", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(application);
 
-                    instance.Setup(mock => mock.HasRedirectUriAsync(application, It.IsAny<CancellationToken>()))
-                        .ReturnsAsync(true);
-
                     instance.Setup(mock => mock.ValidateRedirectUriAsync(application, "http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
 
diff --git a/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs b/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs
index da087aa0..11995df2 100644
--- a/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs
+++ b/test/OpenIddict.Tests/OpenIddictProviderTests.Session.cs
@@ -61,13 +61,36 @@ namespace OpenIddict.Tests
             Assert.Equal("Invalid request: timeout expired.", response.ErrorDescription);
         }
 
+        [Theory]
+        [InlineData("/path", "The 'post_logout_redirect_uri' parameter must be a valid absolute URL.")]
+        [InlineData("/tmp/file.xml", "The 'post_logout_redirect_uri' parameter must be a valid absolute URL.")]
+        [InlineData("C:\\tmp\\file.xml", "The 'post_logout_redirect_uri' parameter must be a valid absolute URL.")]
+        [InlineData("http://www.fabrikam.com/path#param=value", "The 'post_logout_redirect_uri' parameter must not include a fragment.")]
+        public async Task ValidateLogoutRequest_RequestIsRejectedWhenRedirectUriIsInvalid(string address, string message)
+        {
+            // Arrange
+            var server = CreateAuthorizationServer();
+
+            var client = new OpenIdConnectClient(server.CreateClient());
+
+            // Act
+            var response = await client.PostAsync(LogoutEndpoint, new OpenIdConnectRequest
+            {
+                PostLogoutRedirectUri = address
+            });
+
+            // Assert
+            Assert.Equal(OpenIdConnectConstants.Errors.InvalidRequest, response.Error);
+            Assert.Equal(message, response.ErrorDescription);
+        }
+
         [Fact]
-        public async Task ValidateLogoutRequest_RequestIsRejectedWhenRedirectUriIsInvalid()
+        public async Task ValidateLogoutRequest_RequestIsRejectedWhenRedirectUriIsUnknown()
         {
             // Arrange
             var manager = CreateApplicationManager(instance =>
             {
-                instance.Setup(mock => mock.ValidateLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
+                instance.Setup(mock => mock.ValidatePostLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                     .ReturnsAsync(false);
             });
 
@@ -85,10 +108,10 @@ namespace OpenIddict.Tests
             });
 
             // Assert
-            Assert.Equal(OpenIdConnectConstants.Errors.InvalidClient, response.Error);
+            Assert.Equal(OpenIdConnectConstants.Errors.InvalidRequest, response.Error);
             Assert.Equal("Invalid post_logout_redirect_uri.", response.ErrorDescription);
 
-            Mock.Get(manager).Verify(mock => mock.ValidateLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()), Times.Once());
+            Mock.Get(manager).Verify(mock => mock.ValidatePostLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()), Times.Once());
         }
 
         [Fact]
@@ -101,7 +124,7 @@ namespace OpenIddict.Tests
             {
                 builder.Services.AddSingleton(CreateApplicationManager(instance =>
                 {
-                    instance.Setup(mock => mock.ValidateLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
+                    instance.Setup(mock => mock.ValidatePostLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
                 }));
 
@@ -139,7 +162,7 @@ namespace OpenIddict.Tests
             {
                 builder.Services.AddSingleton(CreateApplicationManager(instance =>
                 {
-                    instance.Setup(mock => mock.ValidateLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
+                    instance.Setup(mock => mock.ValidatePostLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(true);
                 }));
             });
@@ -165,7 +188,7 @@ namespace OpenIddict.Tests
             {
                 builder.Services.AddSingleton(CreateApplicationManager(instance =>
                 {
-                    instance.Setup(mock => mock.ValidateLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
+                    instance.Setup(mock => mock.ValidatePostLogoutRedirectUriAsync("http://www.fabrikam.com/path", It.IsAny<CancellationToken>()))
                         .ReturnsAsync(false);
                 }));