求助：采用授权码方式的Google Actions智能家居账号关联失败

Let’s break down the possible reasons why your client isn’t triggering the /token endpoint call after receiving the authorization code redirect, and how to fix them:

• Verify Client Configuration & Logic
  Double-check that your client app has the correct /token endpoint URL configured—even a tiny typo (like missing https or a trailing slash) can prevent the request from firing. If you’re using a custom client implementation instead of an OAuth library, make sure your code explicitly handles the redirect callback: it should extract the code and state parameters from the URL, then immediately send a POST request to /token with those values plus client_id, client_secret (if applicable), and grant_type=authorization_code.

• Validate Redirect Response Parameters
  Confirm the code you’re returning is properly formatted and valid. If the code is malformed, expired, or doesn’t match the client’s expectations, the client might silently abort the flow. Also, ensure the state parameter in the redirect matches exactly what was sent in the initial /oauth request—most clients enforce this to prevent CSRF attacks, and a mismatch will stop the process cold.

• Check Client-Side Logs & Network Traffic
  Fire up your browser’s DevTools (Network tab) or your client app’s logging system to see if the /token request is even being sent. If it is, look for error status codes (4xx/5xx) that might indicate a problem with the request. If it’s not being sent at all, your client’s callback handler might have a bug (like an uncaught exception) that’s stopping execution before the request is made.

• Ensure CORS is Configured Correctly (For Browser Clients)
  If your client is a browser-based SPA, your /token endpoint needs to allow cross-origin requests from the client’s domain. Make sure the endpoint returns CORS headers like Access-Control-Allow-Origin (set to your client’s origin) and Access-Control-Allow-Methods (including POST). Without these, the browser will block the request silently.

• Confirm Authorization Code Storage & Validity
  On your server, verify that the authcode you generated is stored correctly (e.g., in a database or Redis) with the associated client_id, redirect_uri, and expiration timestamp. If the code isn’t found or is expired when the client finally calls /token, the server will return an error—and some clients might not surface this error to you, making it seem like the request never happened.

内容的提问来源于stack exchange，提问作者Rene Klootwijk