HTTP header reference
Browse and search common HTTP request and response headers - description, example, and one-click copy.
Authentication
AuthorizationrequestWWW-AuthenticateresponseProxy-AuthorizationrequestContent
Content-TypebothContent-LengthbothContent-EncodingbothContent-LanguagebothContent-DispositionresponseAcceptrequestAccept-EncodingrequestAccept-LanguagerequestTransfer-EncodingresponseCaching
Cache-ControlbothETagresponseIf-None-MatchrequestIf-Modified-SincerequestLast-ModifiedresponseVaryresponseCORS
Access-Control-Allow-OriginresponseAccess-Control-Allow-MethodsresponseAccess-Control-Allow-HeadersresponseAccess-Control-Allow-CredentialsresponseAccess-Control-Max-AgeresponseAccess-Control-Expose-HeadersresponseOriginrequestSecurity
Strict-Transport-SecurityresponseContent-Security-PolicyresponseX-Frame-OptionsresponseX-Content-Type-OptionsresponseReferrer-PolicyresponsePermissions-PolicyresponseRouting
LocationresponseHostrequestRefererrequestUser-AgentrequestRetry-AfterresponseX-Forwarded-ForrequestCustom
X-Request-IDboth