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CORS Tester

Name: UsefulDevTools
Author: UsefulDevTools

Professional CORS (Cross-Origin Resource Sharing) testing tool for debugging cross-origin requests, validating headers, and analyzing browser security policies with real-time testing and detailed error reporting.

Helpful?

Professional CORS Testing Tool

Test URL

HTTP Method

Origin

Custom Headers (one per line, format: Name: Value)

Request Body (for POST, PUT, PATCH)

Include Credentials (cookies, authorization headers)

CORS Tester

Professional CORS Testing Tool

How This Tool Works

Frequently Asked Questions

What is CORS and why is it important for web development?

When do browsers send preflight OPTIONS requests?

Which CORS headers should I configure on my server?

How do I systematically test CORS configurations?

What are the security implications of CORS configuration?

How can I effectively debug CORS issues?

How do different frameworks handle CORS?

How does CORS impact application performance?