How to use lftp to accelerate ftp/https download speed on Linux/UNIX

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lftp is a file transfer program. It allows sophisticated FTP, HTTP/HTTPS, and other connections. If the site URL is specified, then lftp will connect to that site otherwise a connection has to be established with the open command. It is an essential tool for all a Linux/Unix command line users. I have already written about Linux ultra fast command line download accelerator such as Axel and prozilla. lftp is another tool for the same job with more features. lftp can handle seven file access methods: