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    Forbidden header name

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    A forbidden header name is an HTTP header name that cannot be modified programmatically.

    These are forbidden, so the user agent retains full control over them. Names starting with `Sec-` are reserved for creating new headers safe from APIs using Fetch that grant developers control over headers, such as XMLHttpRequest.

    Forbidden headers names start with Proxy- or Sec-, or consists of one of these:

    • Accept-Charset
    • Accept-Encoding
    • Access-Control-Request-Headers
    • Access-Control-Request-Method
    • Connection
    • Content-Length
    • Cookie
    • Cookie2
    • Date
    • DNT
    • Expect
    • Host
    • Keep-Alive
    • Origin
    • Proxy-
    • Sec-
    • Referer
    • TE
    • Trailer
    • Transfer-Encoding
    • Upgrade
    • Via

    Note: The User-Agent header is no longer forbidden, as per spec — see forbidden header name list (this was implemented in Firefox 43,) so can now be set in a Fetch Headers object, via XHR setRequestHeader(), etc.

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