Facebook Webhook订阅Feed事件无触发问题求助

Troubleshooting Steps & Possible Fixes #

Let's break down the most likely causes and how to resolve them:

1. Verify Required Permissions for Feed Events
   For development-mode apps, your page_access_token must have the pages_show_list and pages_read_engagement permissions to receive Feed event webhooks. Even if your subscription status looks valid, missing these permissions will block event pushes.
   Run this debug call to check your token's permissions:

   GET /debug_token?input_token={{test_page_access_token}}&access_token={{app_access_token}}
   

   Ensure both permissions are listed in the scopes array.

2. Check if You're Subscribed to All Relevant Fields

   • The feed field covers posts and comments, but likes (reactions) require a separate reactions field subscription. You won't get like notifications unless you add this field to your webhook setup.
   • Double-check your webhook configuration in the Facebook Developer Portal to confirm feed and reactions are both enabled for your page.

3. Confirm Event Trigger is from a Test User/Admin
   In development mode, webhook events only fire for actions taken by the app's admins, developers, or registered test users. If you're using a regular (non-test) account to post/comment/like, no event will be sent. Add your test account to the app's "Roles" section in the Developer Portal and retry the actions with that account.

4. Upgrade Your API Version
   You're using API v3.0, which is quite outdated. Facebook has made significant changes to webhook event logic in newer versions (current stable is v18.0). Old versions may have bugs or deprecated behavior that prevents Feed events from pushing.
   Re-subscribe to the events using a newer API version and test again.

5. Validate Callback URL Handling for Feed Events
   Even though Messages work, Feed events have a different payload structure. Make sure your endpoint:

   • Returns a 200 OK response within 10 seconds of receiving the request
   • Doesn't have any logic that specifically filters out Feed event types
     Use your ngrok dashboard logs to check if Feed event requests are even reaching your endpoint (if they are but failing, you'll see errors there).

6. Check Development Mode Restrictions
   Some Feed event subtypes may require app review to work fully, even in development mode. Head to the Facebook Developer Portal's Webhooks section for your app, and check if there are any warnings or pending review prompts related to the feed or reactions fields.

内容的提问来源于stack exchange，提问作者Frederik Claus