如何在Android中用OAuth2发送HTTP请求？Fitbit API调用报错求助

Hey there! Let's troubleshoot why your Fitbit API requests are failing even with an Access Token in hand. Based on your flow using Chrome Custom Tabs and two activities, here are the most likely culprits to check off one by one:

1. Validate Your Access Token & Scopes #

• First up: make sure your token is actually valid. You can decode the JWT locally with a JWT parser to check its expiration timestamp and the scopes it includes. Fitbit tokens expire after 8 hours by default, so if you generated it a while back, that's probably the issue.
• Double-check that the API endpoint you're hitting matches the scopes you requested during authentication. For example, if you're trying to pull step data but only asked for profile scope during setup, you'll get a 403 Forbidden error every time.

2. Nail Down Request Headers #

Fitbit's API is picky about header formatting—don't skip this:

• The Authorization header must follow the format Bearer {your_access_token}. A common mistake is omitting the space between Bearer and the token, or using Token instead of Bearer. Here's a correct OkHttp example:

  Request fitbitRequest = new Request.Builder()
      .url("https://api.fitbit.com/1/user/-/profile.json")
      .addHeader("Authorization", "Bearer " + yourAccessToken)
      .addHeader("Accept", "application/json")
      .build();
  

• Don't forget to include an Accept: application/json header either—some endpoints will return non-JSON responses if this is missing, leading to parsing errors.

3. Verify Redirect URI & Intent Handling #

• Your redirect URI (configured in the Fitbit Developer Dashboard) must match exactly what's used in your app—including case, slashes, and any custom schemes. If there's even a tiny mismatch, the token you receive might be invalid or lack necessary permissions.
• In TestActivity, confirm you're correctly extracting the access token from the incoming intent. Use getIntent().getData() to grab the redirect URI, then parse out the access_token parameter. A typo here (like looking for token instead of access_token) will leave you with a bad value.

4. Check App Permissions & Network Setup #

• Ensure your AndroidManifest.xml includes the internet permission—without it, your app can't make any API calls at all:

  <uses-permission android:name="android.permission.INTERNET" />
  

• For Android 9+, if you're targeting API level 28 or higher, make sure your network security configuration allows HTTPS connections to Fitbit's endpoints. Custom SSL configurations can also cause handshake failures, so stick to the default unless you have a specific reason not to.

5. Confirm API Endpoint URLs #

• Fitbit's endpoint structure is specific—don't guess the path. For example, using - as the user ID represents the authenticated user (most use cases). A correct activity data endpoint looks like:

  https://api.fitbit.com/1/user/-/activities/date/today.json
  

• Typos in the URL (like missing a segment or using the wrong date format) will result in 404 Not Found errors.

6. Debug the Error Response #

Don't ignore the error details Fitbit sends back! Print the full error response code and body to your logcat—this will tell you exactly what's wrong:

Response response = client.newCall(fitbitRequest).execute();
if (!response.isSuccessful()) {
    String errorBody = response.body() != null ? response.body().string() : "No error body";
    Log.e("FitbitDebug", "Error Code: " + response.code() + " | Message: " + errorBody);
}

• Common codes to watch for:
  • 401 Unauthorized: Token is invalid, expired, or malformed.
  • 403 Forbidden: Missing required scopes for the endpoint.
  • 404 Not Found: Wrong endpoint URL.

Start with debugging the error response—it's the fastest way to narrow down the issue. Once you have the specific code and message, cross-reference it with the checks above, and you'll get your requests working in no time.

内容的提问来源于stack exchange，提问作者Jordy Nelson