Title: Invalid WP API response
Last modified: May 8, 2026

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# Invalid WP API response

 *  [PRABIN M](https://wordpress.org/support/users/prabinm/)
 * (@prabinm)
 * [1 day, 12 hours ago](https://wordpress.org/support/topic/invalid-wp-api-response-4/)
 * Hi,
 * Getting this error on one of our client site which affecting the page speed and
   overall site performance. Why is this error happening, and how can I solve this?
 * “**Invalid WP API response**
   WordPress gave an unexpected response when notified
   with UCSS results from node 38.114.121.40. Check WP API is properly configured.”

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Support [litetim](https://wordpress.org/support/users/litetim/)
 * (@litetim)
 * [1 day, 10 hours ago](https://wordpress.org/support/topic/invalid-wp-api-response-4/#post-18902570)
 * [@prabinm](https://wordpress.org/support/users/prabinm/) please send a report
   to Litespeed and share the ID generated.
   You can follow these steps: [https://docs.litespeedtech.com/lscache/lscwp/thirdparty/#document-report](https://docs.litespeedtech.com/lscache/lscwp/thirdparty/#document-report)
 *  Thread Starter [PRABIN M](https://wordpress.org/support/users/prabinm/)
 * (@prabinm)
 * [1 day, 9 hours ago](https://wordpress.org/support/topic/invalid-wp-api-response-4/#post-18902620)
 * Hi [@litetim](https://wordpress.org/support/users/litetim/),
 * Thank you for your reply. Sorry to say this, I can’t share the report ID. Because
   this is one of our client’s site and they need absolute privacy on it.
 * Is there any other way to check and sort this issue?
 *  Plugin Support [litetim](https://wordpress.org/support/users/litetim/)
 * (@litetim)
 * [1 day, 9 hours ago](https://wordpress.org/support/topic/invalid-wp-api-response-4/#post-18902646)
 * [@prabinm](https://wordpress.org/support/users/prabinm/) create a ticket and 
   share this topic URL.
   To creat a ticket send a email to: **support at [litespeedtech.com](http://litespeedtech.com)**
   Thank you
 *  [wpfixpath](https://wordpress.org/support/users/wpfixpath/)
 * (@wpfixpath)
 * [1 day, 7 hours ago](https://wordpress.org/support/topic/invalid-wp-api-response-4/#post-18902788)
 * Since you cannot share the report ID publicly, I would debug the response path
   rather than the UCSS result itself.
 * That message usually means the remote LiteSpeed node notified WordPress, but 
   WordPress returned something other than the expected REST/API response.
 * Check these privately:
    1. Open this in a logged-out browser:
       /wp-json/
 * It should return JSON, not HTML, a redirect, a firewall page, or a maintenance
   page.
    2. Check server access logs around the time of the error for requests from:
       38.114.121.40
 * Look at the status code and response type.
    3. Check whether any layer is blocking or changing REST requests:
 *  - Cloudflare/WAF/Bot Fight mode
    - ModSecurity
    - security plugin
    - basic auth
    - maintenance mode
    - custom redirects
    - cache-everything CDN rule
 *  3. Exclude REST/API paths from aggressive cache/security rules:
       /wp-json/*admin-
       ajax.phpLiteSpeed callback/API paths if present in the logs
    4. Temporarily disable UCSS and reproduce. If the warning stops, the issue is likely
       the callback/notification path rather than general page speed.
 * If privacy is the concern, the private ticket is still probably the right route,
   but the server logs should show whether WordPress returned JSON, a 403, a redirect,
   or an HTML error page.

Viewing 4 replies - 1 through 4 (of 4 total)

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 * 4 replies
 * 3 participants
 * Last reply from: [wpfixpath](https://wordpress.org/support/users/wpfixpath/)
 * Last activity: [1 day, 7 hours ago](https://wordpress.org/support/topic/invalid-wp-api-response-4/#post-18902788)
 * Status: not resolved