Chapter 4: HTTP/2: Background, Performance Benefits and Implementations
by Tonino Jankov
On top of the infrastructure of the internet — or the physical network layers — sits the Internet Protocol, as part of the TCP/IP, or transport layer. It's the fabric underlying all or most of our internet communications.
A higher level protocol layer that we use on top of this is the application layer. On this level, various applications use different protocols to connect and transfer information. We have SMTP, POP3, and IMAP for sending and receiving emails, IRC and XMPP for chatting, SSH for remote sever access, and so on.
The best-known protocol among these, which has become synonymous with the use of the internet, is HTTP (hypertext transfer protocol). ...
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