List of HTTP header fields

<p>HTTP header fields are a list of <a href="/facts/String_(computer_science)/4ChJu5WS">strings</a> sent and received by both the client program and server on every HTTP request and response. These <a href="/facts/Header_(computing)/DSbn3tM1">headers</a> are usually invisible to the <a href="/facts/End-user/7IM9qu7N">end-user</a> and are only processed or <a href="/facts/Computer_data_logging/p7FHf8mA">logged</a> by the server and client applications. They define how information sent/received through the connection are encoded (as in <a href="/facts/HTTP_compression/clfoMHvy">Content-Encoding</a>), the session verification and identification of the client (as in <a href="/facts/Browser_cookies/o1laXyng">browser cookies</a>, IP address, <a href="/facts/User-agent/dFEyg2Xj">user-agent</a>) or their anonymity thereof (VPN or proxy masking, user-agent spoofing), how the server should handle data (as in <a href="/facts/Do-Not-Track/51Ic0VD8">Do-Not-Track</a> or <a href="/facts/Global_Privacy_Control/51Ic0VD8">Global Privacy Control</a>), the age (the time it has resided in a shared <a href="/facts/Web_cache/DqIBcWem">cache</a>) of the document being downloaded, amongst others.
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List of HTTP header fields open-in-new

List of HTTP header fields