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curl

    1: Long: header
    2: Short: H
    3: Arg: <header/@file>
    4: Help: Pass custom header(s) to server
    5: Protocols: HTTP
    6: ---
    7: Extra header to include in the request when sending HTTP to a server. You may
    8: specify any number of extra headers. Note that if you should add a custom
    9: header that has the same name as one of the internal ones curl would use, your
   10: externally set header will be used instead of the internal one. This allows
   11: you to make even trickier stuff than curl would normally do. You should not
   12: replace internally set headers without knowing perfectly well what you're
   13: doing. Remove an internal header by giving a replacement without content on
   14: the right side of the colon, as in: -H \&"Host:". If you send the custom
   15: header with no-value then its header must be terminated with a semicolon, such
   16: as \-H \&"X-Custom-Header;" to send "X-Custom-Header:".
   17: 
   18: curl will make sure that each header you add/replace is sent with the proper
   19: end-of-line marker, you should thus \fBnot\fP add that as a part of the header
   20: content: do not add newlines or carriage returns, they will only mess things up
   21: for you.
   22: 
   23: Starting in 7.55.0, this option can take an argument in @filename style, which
   24: then adds a header for each line in the input file. Using @- will make curl
   25: read the header file from stdin.
   26: 
   27: See also the --user-agent and --referer options.
   28: 
   29: Starting in 7.37.0, you need --proxy-header to send custom headers intended
   30: for a proxy.
   31: 
   32: Example:
   33: 
   34:  curl -H "X-First-Name: Joe" http://example.com/
   35: 
   36: \fBWARNING\fP: headers set with this option will be set in all requests - even
   37: after redirects are followed, like when told with --location. This can lead to
   38: the header being sent to other hosts than the original host, so sensitive
   39: headers should be used with caution combined with following redirects.
   40: 
   41: This option can be used multiple times to add/replace/remove multiple headers.