Скачать или смотреть Understanding 400 Error with Google Sign-In: What is the redirect_uri?

Encountering a 400 error with Google Sign-In can be frustrating. Learn what `redirect_uri` means and how to resolve issues with Google OAuth and API integrations.
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Understanding 400 Error with Google Sign-In: What is the redirect_uri?

If you're integrating Google Sign-In to your application and hit a 400 error, you're not alone. This common issue often revolves around a key parameter: the redirect_uri. Understanding this element and its impact can help clear up the confusion and get your integration back on track.

What is a 400 Error?

A 400 error indicates a bad request from the client to the server. When using Google OAuth, this usually means there’s something off with your request setup.

The Role of redirect_uri

The redirect_uri is a critical part of your OAuth configuration. It specifies the URL to which users are redirected after they have authenticated with Google. Think of it as the GPS coordinate telling Google where to send your user post-login.

Common Causes of the 400 Error

Mismatch in redirect_uri: A common cause of the 400 error is a mismatch between the redirect_uri provided in the OAuth request and the one registered in the Google API Console.

Unregistered redirect_uri: If you have not registered the provided redirect_uri, Google will reject the request, resulting in a 400 error.

Incorrect Client ID: Ensure that you are using the correct client ID associated with the registered redirect_uri.

Solving the Issue

Double-check URLs: Ensure that the redirect_uri in your OAuth requests matches exactly with the URL(s) registered in the Google API Console. Even trivial differences can lead to errors.

Update Registered URIs: If necessary, update the redirect_uri in the Google API Console to match the one you are using in your application.

Debug Logging: Use debug logs to get more insights into where the mismatch or other configuration issues might be occurring.

Final Thoughts

Errors with Google Sign-In can be frustrating, but they are usually straightforward to resolve once you understand the role of redirect_uri. By ensuring that your redirect_uri is correctly configured and matches the registered details, you can avoid the common 400 error and provide a smoother user experience.