![]() ![]() IANA also maintains a registry of proposed new HTTP headers. Whitespace before the value is ignored.Ĭustom proprietary headers have historically been used with an X- prefix, but this convention was deprecated in June 2012 because of the inconveniences it caused when nonstandard fields became standard in RFC 6648 others are listed in an IANA registry, whose original content was defined in RFC 4229. An HTTP header consists of its case-insensitive name followed by a colon ( :), then by its value. HTTP headers let the client and the server pass additional information with an HTTP request or response.
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