Скачать или смотреть Solving the Google OAuth Access Token Empty Issue for Unity Developers

Discover the solution to the frustrating `Google OAuth Access Token Empty` problem when accessing Google Calendar with Unity using C# . Learn how to properly configure your API request and avoid common mistakes.
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This video is based on the question https://stackoverflow.com/q/64566306/ asked by the user 'Niklas S' ( https://stackoverflow.com/u/6180972/ ) and on the answer https://stackoverflow.com/a/64578919/ provided by the user 'Niklas S' ( https://stackoverflow.com/u/6180972/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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Solving the Google OAuth Access Token Empty Issue for Unity Developers

When working on a Unity project that integrates with Google services like Google Calendar, you may encounter a common issue: receiving an empty response or a 404 error when trying to obtain an OAuth access token. This problem can leave developers frustrated, especially when solutions seem scarce. In this guide, we'll address this issue head-on and provide a clear, step-by-step guide on how to successfully retrieve the access token using C# .

Understanding the Problem

In this scenario, the developer is trying to authenticate with Google’s OAuth 2.0 system to access Google Calendar. The initial implementation returns errors, which usually signifies a problem with the format of the HTTP request being made to the Google OAuth server. Commonly, developers overlook the requirements outlined in the OAuth documentation, such as the naming conventions for request parameters.

Common Issues Encountered

Empty Access Token: Indicates the request body might not be structured correctly.

404 Error: Often results from incorrect URLs or missing parameters.

Parameter Misnaming: Using wrong HTTP parameter names can lead to failed requests.

Step-by-Step Solution

1. Review Your Code

Let’s look at the original code that was causing issues:

[[See Video to Reveal this Text or Code Snippet]]

In this code, the parameter used for the authorization code is incorrectly named as auth_code. This is more than just a naming error; it leads to the failure of the OAuth process.

2. Correct the Parameter Name

The solution discovered was to change the line:

[[See Video to Reveal this Text or Code Snippet]]

to:

[[See Video to Reveal this Text or Code Snippet]]

This change aligns the parameter name with the OAuth 2.0 documentation, which specifies that the authorization code should be sent with the key code instead of auth_code.

3. Ensure Additional Parameters are Correct

Verify that all other parameters are also correctly named as per the official Google OAuth 2.0 documentation:

client_id

client_secret

grant_type (generally set to authorization_code for this flow)

redirect_uri (needs to match what you've set in the Google API console)

4. Whitelisting the Redirect URI

If you're still struggling, ensure that your redirect URI is whitelisted in the Google Cloud Console:

Navigate to your project's Credentials section.

Find your OAuth 2.0 Client ID and check the Authorized redirect URIs.

Make sure http://localhost:4444 is included, as this is the URI being used in your code.

Conclusion

By carefully reviewing and correcting your request parameters as outlined above, you can overcome the Google OAuth Access Token Empty issue when working with Unity and C# . This problem may be common, but with the right knowledge and adjustments, you can successfully authenticate and access Google services in your projects. Always refer back to the official documentation for the most accurate information and guidelines.

Now that you're equipped with a solution, it's time to get back to building amazing applications with Unity and Google's powerful APIs! Happy coding!