rfc3986
Network Working Group T. Berners-Lee Request for Comments: 3986 W3C/MIT STD: 66 R. Fielding Updates:1738 Day Software Obsoletes:2732, 2396, 1808 L. Masinter Category: Standards Track Adobe Systems January 2005 Uniform Resource Identifier (URI): Generic Syntax Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.
https://datatracker.ietf.org/doc/html/rfc3986