curl/docs/cmdline-opts/dump-header.md

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c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: dump-header Short: D Arg: Help: Write the received headers to Protocols: HTTP FTP Category: http ftp Added: 5.7 Multi: single See-also:

• output Example:
• --dump-header store.txt $URL
• --dump-header - $URL -o save ---

--dump-header

Write the received protocol headers to the specified file. If no headers are received, the use of this option creates an empty file. Specify - as filename (a single minus) to have it written to stdout.

Starting in curl 8.10.0, specify % (a single percent sign) as filename writes the output to stderr.

When used in FTP, the FTP server response lines are considered being "headers" and thus are saved there.

Starting in curl 8.11.0, using the --create-dirs option can also create missing directory components for the path provided in --dump-header.

Having multiple transfers in one set of operations (i.e. the URLs in one --next clause), appends them to the same file, separated by a blank line.