7b7756fd_s_File_Sharing_and_FTP_Hosting__Purpose
[Range] 1xx [Purpose] 
Positive Preliminary Reply The request is being initiated and you should expect another reply before proceeding with a new command. (The user-process sending another command before the completion reply would be in violation of protocol; but server-FTP processes should queue any commands that arrive while a preceding command is in progress.) This type of reply can be used to indicate that the command was accepted and the user-process may now pay attention to the data connections, for implementations where simultaneous monitoring is difficult. The server-FTP process may send at most, one 1xx reply per command.
SmartFile | Business File Sharing and FTP Hosting
Purpose