Passing binary data to curl without using a @file

You can pass data into curl via STDIN like so:

echo -e '...data...\n' | curl -X POST --data-binary @- http://foo.com

The @- tells curl to pull in from STDIN.

To pipe binary data to curl (for example):

echo -e '\x03\xF1' | curl -X POST --data-binary @- http://foo.com

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