CORS Tester

Use this little website to test if a URL is setup correctly to work with CORS.

Shareable link: https://cors-test.codehappy.dev/?method=get&origin=https%3A%2F%2Fcors-test.codehappy.dev%2F&url=https%3A%2F%2Fmojobus.org%2F.well-known%2Fnostr.json

Results

This URL will not work correctly with CORS.

What's wrong?

It does not have the access-control-allow-origin header set to *. Without this header, requests from other domains cannot be made to it via a users browser.

How to fix it?

If you have access to the server for the URL, you'll need to modify it to add the access-control-allow-origin header. If you do not have access, you'll need to upload the file somewhere else.

Headers

These are the response headers received when making the request.


  accept-ranges: bytes
cf-cache-status: DYNAMIC
cf-ray: 95081ec851f8eade-ORD
connection: keep-alive
content-length: 111
content-type: application/json
date: Mon, 16 Jun 2025 06:06:16 GMT
etag: "6747587c-6f"
last-modified: Wed, 27 Nov 2024 17:35:56 GMT
server: cloudflare
vary: Accept-Encoding
x-content-type-options: nosniff
x-powered-by: centminmod
x-xss-protection: 1; mode=block

CORS tester was built by @mscccc. The code is available on GitHub. Sponsored by HTML/CSS to Image.