HTTP/2
Topics: HTTP
HTTP/2 multiplexes requests over TCP, but because TCP delivers an ordered byte stream, packet loss can delay data for multiple streams at once.
Subtopics
Head of Line blocking
One form of Head of Line blocking in HTTP/1.1 is when the number of allowed parallel requests in the browser is used up, and subsequent requests need to wait for the former ones to complete. HTTP/2 addresses this issue through request multiplexing, which eliminates HOL blocking at the application layer, but HOL still exists at the transport (TCP) layer. HTTP/3 aims to solve this issue by using UDP as its transport layer protocol.