developer.mozilla.org/en-US/docs/Web/HTTP/Headers

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      HTTP headers
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      HTTP headers let the client and the server pass additional information with a message in a request or response. In HTTP/1.X, a header is a case-insensitive name followed by a colon, then optional whitespace which will be ignored, and finally by its value (for example: Allow: POST). In HTTP/2 and above, headers are displayed in lowercase when viewed in developer tools (accept: */*), and prefixed with a colon for a special group of pseudo-headers (:status: 200). You can find more information on the syntax in each protocol version in the HTTP messages page.

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