I do find myself using wget to download things because I don't have to remember the curl option to follow redirects, and wget saves the file using the same name as the last bit of the uri.
Even better would be to use `curl -LOJ`, so if the filename is not in the url, but in the `Content-Disposition filename` http response header, curl would get the filename from there.
Just FYI, there's a way to get to the QEMU console with a certain keyboard shortcut. There could be potential for mischief (if you are logging the sessions look at the one that ended just now with "too much data written to the terminal", that was me trying to attach the host's /etc/passwd as a raw disk image to the VM).
Even with that disabled I still wouldn't trust it (QEMU devs didn't originally plan for its stdin to be attacker-controlled, so there could be subtle bugs even with monitor disabled - remember the GRUB bug where you could bypass the password with specific keystrokes). I would've personally made it to simulate a serial port to the guest and the browser-based console being connected to that.
Cool, but I think spawning VMs on server is overkill for that.
It should be possible to build cURL with Emscripten with fake socket interface to verify requests.
