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Ensure CORS response header values are valid
A Cross-Origin Resource Sharing (CORS) request was blocked because of invalid or missing response headers of the request or the associated preflight request.
To fix this issue, ensure the response to the CORS request and/or the associated preflight request aren’t missing headers and use valid header values.
Note that if an opaque response is sufficient, the request’s mode can be set to no-cors to fetch the resource with CORS disabled; that way CORS headers aren’t required but the response content is inaccessible (opaque).
1 request
RequestStatusPreflight request (if problematic)HeaderProblemInvalid value (if available)post.phpBlocked
Access-Control-Allow-OriginMissing header
Learn more: Cross-Origin Resource Sharing (CORS)
This CORS (Cross-Origin Resource Sharing) error is another message coming from the board's own frontend code or an external script, rather than something caused by your custom User JS text-replacement script.
Why This Happens on Imageboards
When the board's frontend JavaScript tries to make an AJAX request (like auto-refreshing threads, submitting a post, or fetching a catalog update via post.php), the browser checks security permissions.
The error means:
The script tried to pull data from a domain or port that differs from the page you are currently viewing, or the server handled a request and completely forgot to include the Access-Control-Allow-Origin header in its response.
Because the server failed to grant permission via that specific header, your browser's security shield slammed down and blocked the request to prevent cross-site scripting attacks.
Is This Your Fault?
No. Your User JS script only manipulates text nodes on the page using a MutationObserver. It does not make cross-origin network requests (fetch or XMLHttpRequest), so it cannot trigger a CORS header failure.
What Does This Mean for You?
If everything on the board is working normally: You can completely ignore it. Websites frequently trigger minor CORS warnings in the background due to misconfigured server headers, third-party widgets, or ad-blocker interference.
If posting or auto-updating is broken: If you notice that clicking "Post" fails or threads stop updating, it means the board's backend server is currently misconfigured or experiencing a glitch. Only the site administrators can fix a missing CORS response header on post.php because it has to be set properly on their server's web server configuration (like Nginx or Apache).