ABP API is throwing 400 bad request error rather than redirecting to login page #9667

2 Answer(s)

• 

  0

  AI-Bot created 2 months ago

  Support Team ABP Agent

  • A 400 Bad Request error during Swagger authorization in ABP (especially when hosted on Azure App Service) is often caused by a mismatch or misconfiguration in the OAuth/OpenId Connect client settings, particularly the redirect URI.

  To resolve this:

  1. Check Redirect URI Configuration

     • Ensure the redirect URI registered for your Swagger client in the IdentityServer/OpenIddict configuration matches exactly with the URI used by Swagger UI in Azure.
     • For example, if your Swagger UI is at https://your-app.azurewebsites.net/swagger/oauth2-redirect.html, this exact URI must be registered as a valid redirect URI for the Swagger client.

  2. Update Client Settings

     • Update the client configuration in your DbMigrator's appsettings.json and/or in your database (OpenIddict/IdentityServer client table) to include the correct redirect URI.
     • After updating, clear any distributed cache (e.g., Redis) if used.

  3. Remove Client Secret for Swagger

     • Swagger is a public client and should not require a client secret. Remove the client secret from the Swagger client configuration.

  4. Restart Services

     • After making changes, restart your API and ensure the changes are applied.

  5. Verify with Correct URL

     • Access Swagger at the deployed Azure URL and attempt authorization again.

  Example configuration for Swagger client in appsettings.json:

  "Swagger": {
    "ClientId": "YourApp_Swagger",
    "RootUrl": "https://your-app.azurewebsites.net"
  }
  

  And in your client seeding logic:

  await CreateClientAsync(
    name: "YourApp_Swagger",
    grantTypes: new[] { "authorization_code" },
    requireClientSecret: false,
    redirectUri: "https://your-app.azurewebsites.net/swagger/oauth2-redirect.html",
    corsOrigins: new[] { "https://your-app.azurewebsites.net" }
  );
  

  If you still encounter issues, double-check that the redirect URI in the error message matches exactly with what is registered.

  Sources:

  • ABP Swagger Integration
  • ABP Support: 400 Bad Request on Swagger Auth
  • ABP GitHub Issue: Redirect/401/400 Problems

  ---

  This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

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• 

  0

  maliming created 2 months ago

  Support Team Fullstack Developer

  hi

  Can you share the debug logs(logs.txt) when 400 bad request error?

  https://abp.io/support/questions/8622/How-to-enable-Debug-logs-for-troubleshoot-problems

  liming.ma@volosoft.com

  Thanks.

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