determine if server supports resume get request

Question

How does one determine if a server supports resuming a file transfer or get request?

My thoughts were to set the header to start the get request at byte \"2\" instead of

Answer 1

You can test it out, starting, stopping, then restarting a download:

curl --continue-at - http://... >> file.out

For whatever reason, this (from another answer) gave me a 403:

curl -i -X HEAD --header "Range: bytes=50-100" http://...