问题
I've been reading about the FTP protocol, but I cannot find in the protocol commands this feature that allows you to resume a partial download I have heard about.
How does it work? is there any "range" protocol command that I cannot find?
Cheers.
回答1:
Resume is implemented using the REST command - see RFC 3659
来源：https://stackoverflow.com/questions/5678119/how-does-a-ftp-server-resume-a-download