Webhook not capturing response

If your webhook is not capturing a response in FlowMattic, there could be a variety of reasons causing this issue. Here are the most common causes and steps you can take to resolve them:

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1. Firewall Blocking POST Requests to Your Site

Issue:

Your server’s firewall might be configured to block incoming POST requests, preventing the webhook from capturing the data.

Solution:

• Check your hosting provider’s firewall settings or security plugins (e.g., Wordfence, Sucuri, or similar tools).
• Whitelist the IP addresses of the service or app sending the webhook request.
• Temporarily disable the firewall and test the webhook to confirm if this is the issue.

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2. Cloudflare Blocking POST Requests

Issue:

Cloudflare’s security rules might block incoming POST requests if they are considered suspicious or if specific firewall rules are enabled.

Solution:

• Log in to your Cloudflare account and navigate to the Firewall Rules or Security section.
• Check for any rules that might block POST requests and disable them temporarily.
• Add a Page Rule in Cloudflare to bypass security for your webhook URL:
  • URL Pattern: https://yoursite.com/webhook/*
  • Set the rule to disable security features like Firewall, Browser Integrity Check, or Rate Limiting for this path.
• Test the webhook after applying the changes.

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3. Permalink Settings Set to Default

Issue:

If your WordPress Permalink Settings are set to “Plain” (default), the webhook URL may not be correctly routed to the appropriate endpoint.

Solution:

• Navigate to Settings > Permalinks in your WordPress admin dashboard.
• Change the permalink structure to any other format (e.g., Post Name or Custom Structure).
• Save the changes and test the webhook again.

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4. Website Behind an Under Construction or Login Proxy

Issue:

If your site is in Under Construction Mode or requires a login to access, the webhook request may be blocked before reaching FlowMattic.

Solution:

• Temporarily disable any Under Construction or Maintenance Mode plugins and test the webhook.
• If your site requires a login to access:
  • Use FlowMattic’s Webhook URL Base setting and switch it to REST API mode. This often works better for sites behind login proxies.
  • Alternatively, whitelist the webhook URL or exclude it from the restriction in your maintenance mode or login settings.

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Additional Tips for Debugging

1. Test the Webhook URL:
   • Use tools like Postman or Webhook.site to manually send a POST request to your webhook URL.
   • Verify if the request is received in FlowMattic’s Webhook Listener.
2. Enable Debug Mode:
   • If you’re unable to determine the cause, enable debug mode in your WordPress site or hosting server to log incoming requests.
3. Check Server Logs:
   • Access your server’s error logs to check if POST requests are being blocked or timing out.
4. Contact Your Hosting Provider:
   • If none of the above resolves the issue, contact your hosting provider to ensure POST requests to your site are not blocked by server settings.

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Conclusion

Webhook response issues often stem from server configurations or external security measures. By systematically addressing the potential causes listed above, you can quickly identify and resolve the problem. If the issue persists, FlowMattic’s support team is always here to assist!