Do not use `try catch` to determine the BlazorServer running mode.

Resolve #18224

framework/src/Volo.Abp.AspNetCore.Components.Server/Volo/Abp/AspNetCore/Components/Server/Extensibility/BlazorServerLookupApiRequestService.cs

@@ -47,21 +47,19 @@ public class BlazorServerLookupApiRequestService : ILookupApiRequestService, ITr
         var uri = new Uri(url, UriKind.RelativeOrAbsolute);
         if (!uri.IsAbsoluteUri)
         {
-            var baseUrl = string.Empty;
-            try
+            var remoteServiceConfig = await RemoteServiceConfigurationProvider.GetConfigurationOrDefaultOrNullAsync("Default");
+            if (remoteServiceConfig != null)
             {
-                //Blazor tiered -- mode
-                var remoteServiceConfig = await RemoteServiceConfigurationProvider.GetConfigurationOrDefaultAsync("Default");
-                baseUrl = remoteServiceConfig.BaseUrl;
+                // Blazor tiered mode
+                var baseUrl = remoteServiceConfig.BaseUrl;
                 client.BaseAddress = new Uri(baseUrl);
                 AddHeaders(requestMessage);
-                await HttpClientAuthenticator.Authenticate(new RemoteServiceHttpClientAuthenticateContext(client,
-                    requestMessage, new RemoteServiceConfiguration(baseUrl), string.Empty));
+                await HttpClientAuthenticator.Authenticate(new RemoteServiceHttpClientAuthenticateContext(client, requestMessage, new RemoteServiceConfiguration(baseUrl), string.Empty));
             }
-            catch (AbpException) // Blazor-Server mode.
+            else
             {
-                baseUrl = NavigationManager.BaseUri;
-                client.BaseAddress = new Uri(baseUrl);
+                // Blazor server  mode
+                client.BaseAddress = new Uri(NavigationManager.BaseUri);
                 foreach (var header in HttpContextAccessor.HttpContext!.Request.Headers)
                 {
                     requestMessage.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray());