Create an option that allows --download to output progress somewhere that isn't stderr

[PerfectlyInternal]

When using HTTPie in a windows PowerShell session, redirecting output from stderr is unnecessarily difficult, particularly when debugging, as a significant amount of information is sent there. Some sort of option that would allow me to set an output file to be used instead of stderr would be very useful, especially when debugging.

[jkbrzt]

Thanks, for pointing this out, @PerfectlyInternal!

I can see a bigger theme forming around the issues you’ve reported: The ability to specify to which standard stream the output should go via --options, and additionally specify which part of the exchange should go where (e.g., headers to stderr and body elsewhere).

Related: #1014 #889

You’re welcome to join our Discord where we can chat about this: https://httpie.io/chat.