HTTP Header Explorer

Every HTTP header explained with examples and common mistakes. Searchable by category: request, response, security, caching, CORS. Generate security header configurations.

HTTP Header Explorer

Complete reference for HTTP headers. Searchable, categorized, with examples and common mistakes. Generate security header configurations.

AcceptRequest

Tells the server what content types the client can handle.

AuthorizationRequest

Sends credentials for authenticating with the server.

User-AgentRequest

Identifies the client application making the request.

HostRequest

Specifies the domain name of the server (required in HTTP/1.1).

CookieRequest

Sends stored cookies to the server.

RefererRequest

URL of the page that linked to the current request.

If-None-MatchRequest

Makes request conditional; server returns 304 if ETag matches.

If-Modified-SinceRequest

Only return the resource if it has been modified since the given date.

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Select a header from the list to see full details, examples, and common mistakes.