Curl --form with Zig std

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By adding --trace-ascii output-file.txt in your curl command line, the body of the message that curl sends to server is recorded in output-file.txt. You can also use --trace-ascii - to send the output to your terminal standard output.

What you need to specify in the header are:

  • the Content-Type as multipart/form-data; boundary=RANDOM-BOUNDARY where RANDOM-BOUNDARY is a line separator that must not exist in the form data and as any line of the posted files.
  • the Content-Length as the total length in bytes of the message without header, including all the separators.

In the body each line is also separated by \r\n, the first and the last line must have RANDOM-BOUNDARY
For each form field (e.g. -F f2=arg2) you must have a part as:

Content-Disposition: form-data; name="f2"

arg2

and for file contents you must use:

Content-Disposition: form-data; name="f1"; filename="file"
Content-Type: text/plain

Contents of file

Each part must be separated by RANDOM-BOUNDARY.

See also: How do I post a file to a website?

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