True. AFAIU the reason is that Curl wants to make a single request (modulo redirects), whereas making -OJC- work would require two: issue a HEAD to receive the

True. AFAIU the reason is that Curl wants to make a single request (modulo redirects), whereas making -OJC- work would require two: issue a HEAD to receive the Content-Disposition header and learn the file name, then look at that file and see how long it is, then issue a GET with a Range header to request the suffix you still need to download. With other methods I don’t think you could make this work at all. I don’t know if Stenberg is opposed to a GET-specific solution, perhaps that could be a fun project. (Although I’ve encountered noncompilant servers that couldn’t handle HEADs.)