CORS Tester - CORS Doesn't Have to Be Hard!

2 min read Original article ↗

CORS Doesn't Have to Be Hard

Enter your API URL, verify CORS policies, and get actionable insights to resolve issues instantly. Handy tool for developers and API testers!

✅ Check CORS Headers   ✅ Debug CORS Errors   ✅ Ensure API Compliance

The endpoint where your request will be sent.

The value of origin header that will be sent in the API call.

Check this to send cookies, authorization headers, or client certificates.

Add additional headers like Authorization, Content-Type, or custom keys.

The request payload sent in POST, PUT, or PATCH requests.

Click this button to share the CORS Test with API URL, origin, and method.

 
 
 
 
 
Checklist For CORS Support
 
     
  •  ✔ OPTIONS request should pass with 200 status 
    Ensure the API endpoint responds to OPTIONS requests with a 200 HTTP response status code.
     
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  •  ✔ 'Access-Control-Allow-Origin' in the response header 
    The OPTIONS (preflight) response must set the 'Access-Control-Allow-Origin' header same as the 'Origin' in the HTTP request. Skip this when the given 'Origin' isn't authorized.
     
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  •  ✔ 'Access-Control-Allow-Methods' in the response header 
    The OPTIONS (preflight) response must specify allowed HTTP methods in the 'Access-Control-Allow-Methods' header.
     
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  •  ✔ 'Access-Control-Allow-Headers' in the response header 
    Ensure the 'Access-Control-Expose-Headers' header is set if custom response headers need to be exposed to the client.
     
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  •  ✔ 'Access-Control-Allow-Credentials' Header Set for Credentials 
    Confirm the 'Access-Control-Allow-Credentials' header is set to 'true' if the request requires credentials (e.g., cookies or tokens).
     
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  •  ✔ Avoid Wildcard in 'Access-Control-Allow-Origin' with Credential 
    When sending 'true' for Credentials in OPTIONS request, avoid returning '*' in 'Access-Control-Allow-Origin' in the HTTP response headers.
     
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  •  ✔ Cache Preflight Responses with Access-Control-Max-Age 
    Set 'Access-Control-Max-Age' to cache OPTIONS preflight responses and reduce overhead. This should be added in the response headers of OPTIONS call. This is optional.
     
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