DevUtilsNow
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// http header · request header

Host

Domain of the server (required in HTTP/1.1)

What the Host header does

Host names the domain (and optional port) the request is for. It's mandatory in HTTP/1.1 because one server/IP can host many sites (virtual hosting), and the server uses Host to route to the right one.

Example

Host: devutilsnow.com

Where it's used

Host 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.