无法生成Uber OAuth Token：UnauthorizedException问题求助

Hey there, let's work through this frustrating org.dmfs.httpessentials.exceptions.UnauthorizedException you're hitting with the oauth2-essentials library. I've dealt with similar OAuth headaches with Uber's API before, so let's break down the most likely fixes step by step:

Common Fixes to Test #

• Double-check your client credentials
  First, confirm you're using the exact Client ID and Client Secret copied from your Uber Developer Dashboard. It's easy to accidentally grab extra spaces or miss a character in the long secret string. Also, make sure you're using credentials for the right environment—Uber's sandbox and production environments are completely separate, so mixing them up will definitely trigger auth failures.

• Ensure redirect URL parity
  Even if you switched to the console's default redirect URL, verify the one in your code matches it exactly—including trailing slashes, capitalization, and any subpaths. Uber's OAuth server is strict about this; even a tiny discrepancy will reject the request.

• Validate your grant type and parameters
  Depending on which OAuth flow you're using:

  • For Authorization Code Flow: Make sure the code parameter you're passing is a valid, unused authorization code (codes expire quickly, so reusing an old one will fail).
  • For Client Credentials Flow: Confirm your Uber app has the necessary scopes enabled for the resources you're trying to access. Missing required scopes can throw unauthorized errors even with valid credentials.

• Fix phone number formatting (if using password grant)
  If you're relying on the password grant flow (note: Uber has deprecated this for most use cases), the phone number must be in full international format with a + prefix—like +15551234567—no hyphens, spaces, or just a leading 1. Omitting the + is a super common mistake that breaks authentication.

• Enable debug logging for more context
  The exception message is pretty vague—turn on debug logging for the oauth2-essentials library to see the full request being sent and the raw response from Uber's token endpoint. Look for specific error codes like invalid_client, invalid_grant, or redirect_uri_mismatch in the response body—these will tell you exactly what's wrong. For Java projects, configure your logging framework (e.g., Logback, Log4j) to set the org.dmfs logger level to DEBUG.

• Confirm environment targeting
  If testing in Uber's sandbox, make sure your post-token API calls go to https://sandbox-api.uber.com, but keep using https://login.uber.com/oauth/v2/token for the token endpoint. Mixing up API endpoints can lead to auth failures even with a valid token.

If you've tried all these steps and still run into the error, sharing sanitized debug logs (remove your Client Secret and personal data) would help narrow down the issue further.

内容的提问来源于stack exchange，提问作者Ryan McCaffrey