https://www.rfc-editor.org/rfc/rfc7230
Aka HTTP/1.1
Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing
Abstract
The Hypertext Transfer Protocol (HTTP) is a stateless application-
level protocol for distributed, collaborative, hypertext information
systems. This document provides an overview of HTTP architecture and
its associated terminology, defines the “http” and “https” Uniform
Resource Identifier (URI) schemes, defines the HTTP/1.1 message
syntax and parsing requirements, and describes related security
concerns for implementations.