CORS Header Generator

Build Access-Control response headers, then evaluate the same request scenario with the CORS Policy Analyzer.

Allowed origin

Allowed methods

Allowed request headers

Exposed response headers

Preflight max-age seconds

Credentials Access-Control-Allow-Credentials: true

ReadyThese are response-header candidates for a server. They do not change browser CORS behavior until your server sends the appropriate values.

Local analysis is not remote verification

Unless a tool explicitly has a direct-fetch action, these HTTP tools do not contact endpoints. Browser fetch cannot bypass CORS, and generated policy text does not prove how a deployed server, browser, proxy or CDN will behave.