Request
User-Agent
Identifies the client application, operating system, and engine making the request.
Syntax
User-Agent: <product>/<version> (<system-info>) <platform> (<platform-details>) <extensions>Example
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 Chrome/120.0Description
The User-Agent header contains a string that identifies the client software. Servers and analytics tools use it to detect browsers, bots, and client platforms.
The format is loosely standardised: it typically includes product tokens, version numbers, and comments. Bots and crawlers send their own identifying strings (e.g. Googlebot). The header can be spoofed, so it should never be used for access control.
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