At present, the commonly used e-mail protocols are SMTP, POP3 and IMAP4, all of which belong to the TCP/IP protocol cluster. By default, the connection is established through TCP port 25, 1 10 and 143 respectively.

QQ application layer protocol is a private protocol, network layer udp, and information transmission uses UDP (instant messaging) protocol. The port is 4000 (sending) and 8000 (receiving), which is the TCP User Datagram Protocol.

Browser Hypertext Transfer Protocol (HTTP) is the most widely used network protocol on the Internet. All WWW documents must conform to this standard.

The general network interaction protocol is based on TCP and UDP. Different player developers may develop customized protocols based on the above two underlying protocols, such as COOLplayer, which has developed its own cool and cptp protocols. However, in terms of network playback, Coldplay still supports video streaming of almost all protocols, such as HTTP, FTP, BT, Coldplay, CPTP, mule and so on.