TRUTHY TOOLS

CORS Headers Reference

Reference table for common CORS request and response headers used to control cross-origin browser requests.

10 CORS headers
Header Type Purpose Example
Access-Control-Allow-Origin Response Specifies which origin is allowed to access the resource. Access-Control-Allow-Origin: https://example.com
Access-Control-Allow-Methods Response Lists HTTP methods allowed for cross-origin requests. Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS
Access-Control-Allow-Headers Response Lists request headers the browser is allowed to send. Access-Control-Allow-Headers: Content-Type, Authorization
Access-Control-Allow-Credentials Response Allows cookies, authorization headers, or TLS client certificates to be included. Access-Control-Allow-Credentials: true
Access-Control-Expose-Headers Response Lets browser JavaScript read specific response headers. Access-Control-Expose-Headers: X-Request-ID, X-RateLimit-Remaining
Access-Control-Max-Age Response Tells the browser how long to cache the preflight response. Access-Control-Max-Age: 86400
Origin Request Sent by the browser to indicate the source origin of the request. Origin: https://example.com
Access-Control-Request-Method Request Used in a preflight request to indicate the actual request method. Access-Control-Request-Method: POST
Access-Control-Request-Headers Request Used in a preflight request to indicate which custom headers will be sent. Access-Control-Request-Headers: Content-Type, Authorization
Vary Response Important when dynamically returning CORS headers, especially by Origin. Vary: Origin

About this tool

CORS Headers helps web developers, API teams, QA engineers, and technical support staff reference common CORS request and response headers with examples. Use it during API debugging, HTTP documentation, browser troubleshooting, and integration testing when you need a focused result you can read, copy, or share without opening a heavier application.

Use cases

  • Use CORS Headers during debugging when you need to reference common CORS request and response headers with examples without leaving the browser.
  • Copy CORS Headers output into tickets, docs, test notes, spreadsheets, or chat threads so teammates can verify the same result.
  • Keep CORS Headers open as a repeatable browser utility for quick checks instead of building a one-off spreadsheet or script.

FAQ

What is CORS Headers best used for?

CORS Headers is best used when you need to reference common CORS request and response headers with examples in a fast, copy-friendly browser workflow.

Who benefits most from the CORS Headers tool?

It is especially helpful for web developers, API teams, QA engineers, and technical support staff who handle API debugging, HTTP documentation, browser troubleshooting, and integration testing, and need clear output without extra setup.

Can I use CORS Headers results in documentation or bug reports?

Yes. The output is designed to be readable and easy to paste into issues, docs, QA notes, or team conversations.