DevUtilsNow
Browse tools
// http header · request header

Cookie

Cookies previously set by the server

What the Cookie header does

The Cookie header sends cookies the server previously set (via Set-Cookie) back on each request to the same site — the mechanism behind sessions and logins. It's sent automatically by browsers, which is why CSRF protections and the SameSite attribute matter.

Example

Cookie: sid=abc123

Where it's used

Cookie is a request header. Request headers are sent by the client to describe the request and what the client can accept.

Other request headers

Accept Accept-Encoding Accept-Language Authorization Content-Type Content-Length Cookie Host Origin Referer User-Agent If-None-Match Range
TOOL

HTTP Headers Parser

Turn a block of raw headers into readable JSON.

REFERENCE

All HTTP Headers

Common request, response, caching, CORS, and security headers.

GUIDE

How to Read and Parse HTTP Headers

The anatomy of headers and how to work with them.