HTTP Protocol version

Http/0.9:http's 1991 prototype version, which only supports the Get method, does not support the MIME type of multimedia content, the http/0.9 definition was originally intended to get simple HTML objects that were soon replaced by http/1.0

http/1.0: The first widely used HTTP version that supports various HTTP headers, some additional methods, and the processing of multimedia objects

http/1.0+: With the rapid development of WEB clients and servers, many features (persistent connections, support for virtual hosts, proxies, etc.) have been added, but not officially standard, an unofficial version of HTTP extension is often referred to as http/1.0+

http/1.1: This version is currently in use, primarily to correct structural flaws in HTTP design, explicit semantics, performance optimizations, removal of some bad features, etc.

Http-ng: AKA http/2.0, the main focus is on performance optimization and a more powerful remote execution framework for service logic, but this version has not yet been formally used

HTTP Protocol version