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curl

    1: Long: dump-header
    2: Short: D
    3: Arg: <filename>
    4: Help: Write the received headers to <filename>
    5: Protocols: HTTP FTP
    6: See-also: output
    7: ---
    8: Write the received protocol headers to the specified file.
    9: 
   10: This option is handy to use when you want to store the headers that an HTTP
   11: site sends to you. Cookies from the headers could then be read in a second
   12: curl invocation by using the --cookie option! The --cookie-jar option is a
   13: better way to store cookies.
   14: 
   15: If no headers are received, the use of this option will create an empty file.
   16: 
   17: When used in FTP, the FTP server response lines are considered being "headers"
   18: and thus are saved there.
   19: 
   20: If this option is used several times, the last one will be used.