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Would be nice if `curl` had something to dump headers to a third file descriptor while outputting the response on stdout.
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This should work?

  curl --dump-header /dev/fd/xxx https://google.com
or

  mkfifo headers.out
  curl --dump-header headers.out https://google.com
unless I'm misunderstanding you.

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Ah yeah, `/dev/fd/xxx` works :) somehow thought that was Linux only.

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(Principal Skinner voice) Ah, it's a Bash expression!

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