CORS Tester Tool
Test if an API endpoint supports Cross-Origin Resource Sharing (CORS)
Results will appear here after testing.
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Enter the URL of the API endpoint you want to test, select an HTTP method, and click "Test CORS Support". The tool will send a request and analyze whether the endpoint allows cross-origin requests.
Understanding CORS (Cross-Origin Resource Sharing)
CORS is a security feature implemented by browsers that restricts web pages from making requests to a different domain than the one that served the original page. To enable cross-origin requests, servers must include specific headers in their responses.
What This Tool Tests For
- Access-Control-Allow-Origin: Checks if the server allows requests from your origin
- Access-Control-Allow-Methods: Verifies which HTTP methods are permitted for cross-origin requests
- Access-Control-Allow-Headers: Shows which headers can be used when making the actual request
- Access-Control-Allow-Credentials: Indicates whether the response can be exposed when credentials flag is true
- Preflight Requests: Tests if OPTIONS requests (preflight) are properly handled
Why CORS Matters for Web Developers
Understanding and properly configuring CORS is crucial when building web applications that consume APIs. Incorrect CORS configurations can block legitimate API requests from your frontend, causing frustrating development experiences and production issues.
Frequently Asked Questions
Q. How does the CORS test work?
The tool makes a real request to the specified endpoint with the appropriate CORS headers and analyzes the response to determine if cross-origin requests are allowed.
Q. What if I need to test an authenticated endpoint?
You can add authorization headers (like Bearer tokens) using the "Custom Headers" feature of this tool.
Q. Is this test conclusive?
The tool provides a good indication of CORS support, but the definitive test is always trying a real cross-origin request from your application.
Q. Why might an API have CORS restrictions?
CORS restrictions help prevent malicious websites from making unauthorized requests to an API using a user's credentials. They are an important security measure for public APIs.
Q. Can I test my own APIs during development?
Yes! This tool is perfect for verifying that your development APIs have the correct CORS headers before integrating with a frontend application.
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