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// http header · request header

User-Agent

Identifier for the client software

What the User-Agent header does

User-Agent identifies the client software — browser, version, and OS, or an API client's name. Servers use it for analytics, feature decisions, and blocking bots, though it's easily spoofed and increasingly reduced for privacy.

Example

User-Agent: Mozilla/5.0 …

Where it's used

User-Agent 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.