add Poly to Abp.Cli.Core and use it GetApiKeyOrNullAsync method.

framework/src/Volo.Abp.Cli.Core/Volo.Abp.Cli.Core.csproj

@@ -19,6 +19,8 @@
     <PackageReference Include="System.Text.Encoding.CodePages" Version="4.7.0" />
     <PackageReference Include="System.Security.Permissions" Version="4.6.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.3.1" />
+    <PackageReference Include="Polly" Version="7.2.0" />
+    <PackageReference Include="Polly.Extensions.Http" Version="3.0.0" />
   </ItemGroup>
 
   <ItemGroup>

framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Commands/SuiteCommand.cs

@@ -60,6 +60,12 @@ namespace Volo.Abp.Cli.Commands
         private async Task InstallSuiteAsync()
         {
             var nugetIndexUrl = await GetNuGetIndexUrlAsync();
+            
+            if (nugetIndexUrl == null)
+            {
+                return;
+            }
+
             var result = CmdHelper.RunCmd("dotnet tool install " + SuitePackageName + " --add-source " + nugetIndexUrl + " -g");
 
             if (result == 0)
@@ -72,6 +78,12 @@ namespace Volo.Abp.Cli.Commands
         private async Task UpdateSuiteAsync()
         {
             var nugetIndexUrl = await GetNuGetIndexUrlAsync();
+
+            if (nugetIndexUrl == null)
+            {
+                return;
+            }
+
             CmdHelper.RunCmd("dotnet tool update " + SuitePackageName + " --add-source " + nugetIndexUrl + " -g");
         }
 
@@ -101,8 +113,8 @@ namespace Volo.Abp.Cli.Commands
         private async Task<string> GetNuGetIndexUrlAsync()
         {
             var apiKeyResult = await _apiKeyService.GetApiKeyOrNullAsync();
-            if (apiKeyResult == null ||
+
-                string.IsNullOrEmpty(apiKeyResult.ApiKey))
+            if (apiKeyResult == null || string.IsNullOrEmpty(apiKeyResult.ApiKey))
             {
                 Logger.LogError("Couldn't retrieve your NuGet API key!");
                 Logger.LogWarning(File.Exists(CliPaths.AccessToken)

framework/src/Volo.Abp.Cli.Core/Volo/Abp/Cli/Licensing/AbpIoApiKeyService.cs

@@ -1,5 +1,12 @@
 using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Http;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+using Polly;
+using Polly.Extensions.Http;
 using Volo.Abp.Cli.Http;
 using Volo.Abp.Cli.ProjectBuilding;
 using Volo.Abp.DependencyInjection;
@@ -10,22 +17,45 @@ namespace Volo.Abp.Cli.Licensing
     public class AbpIoApiKeyService : IApiKeyService, ITransientDependency
     {
         protected IJsonSerializer JsonSerializer { get; }
-
         protected IRemoteServiceExceptionHandler RemoteServiceExceptionHandler { get; }
+        private readonly ILogger<AbpIoApiKeyService> _logger;
 
-        public AbpIoApiKeyService(IJsonSerializer jsonSerializer, IRemoteServiceExceptionHandler remoteServiceExceptionHandler)
+        public AbpIoApiKeyService(IJsonSerializer jsonSerializer, IRemoteServiceExceptionHandler remoteServiceExceptionHandler, ILogger<AbpIoApiKeyService> logger)
         {
             JsonSerializer = jsonSerializer;
             RemoteServiceExceptionHandler = remoteServiceExceptionHandler;
+            _logger = logger;
         }
 
         public async Task<DeveloperApiKeyResult> GetApiKeyOrNullAsync()
         {
             using (var client = new CliHttpClient())
             {
-                var url = $"{CliUrls.WwwAbpIo}api/license/api-key";
+                var response = await HttpPolicyExtensions
-
+                    .HandleTransientHttpError()
-                var response = await client.GetAsync(url);
+                    .OrResult(msg => !msg.IsSuccessStatusCode)
+                    .WaitAndRetryAsync(new[]
+                        {
+                            TimeSpan.FromSeconds(1),
+                            TimeSpan.FromSeconds(3),
+                            TimeSpan.FromSeconds(7)
+                        },
+                        (responseMessage, timeSpan, retryCount, context) =>
+                        {
+                            if (responseMessage.Exception != null)
+                            {
+                                _logger.LogWarning(
+                                    $"{retryCount}. request attempt failed with an error: \"{responseMessage.Exception.Message}\". " +
+                                    $"Waiting {timeSpan.TotalSeconds} secs for the next try...");
+                            }
+                            else if (responseMessage.Result != null)
+                            {
+                                _logger.LogWarning(
+                                    $"{retryCount}. request attempt failed with {responseMessage.Result.StatusCode}-{responseMessage.Result.ReasonPhrase}. " +
+                                    $"Waiting {timeSpan.TotalSeconds} secs for the next try...");
+                            }
+                        })
+                    .ExecuteAsync(async () => await client.GetAsync($"{CliUrls.WwwAbpIo}api/license/api-key"));
 
                 if (!response.IsSuccessStatusCode)
                 {