📄 HTTP Documentation HTTP is defined by these IETF RFCs and IANA registries. Core Specifications The “core” semantics of the HTTP protocol are defined by: RFC 9110: HTTP Semantics RFC 9111: HTTP Caching Those semantics are expressed “on the wire” in three ways: RFC 9112: HTTP/1.1 RFC 9113: HTTP/2 RFC 9114: HTTP/3 Later versions of HTTP offer field compression: RFC 7541: HPACK Header Compression f