Article From:https://www.cnblogs.com/luguoshuai/p/9124225.html

FileThe protocol is mainly used to access files in local computers, just like opening files in the Windows resource manager. The basic format is as follows: the file:/// file path.

FTPIt’s a file transfer protocol that can be used on the Internet. For example, you have a web site on a server that can access files on the server through FTP.

HTTP The protocol defines file transfer between server side and client side.

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