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PROPOSED STANDARD
Errata Exist
Internet Engineering Task Force (IETF) R. Fielding, Ed.
Request for Comments: 7231 Adobe
Obsoletes: 2616 J. Reschke, Ed.
Updates: 2817 greenbytes
Category: Standards Track June 2014
ISSN: 2070-1721
Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content
Abstract
The Hypertext Transfer Protocol (HTTP) is a stateless application-
level protocol for distributed, collaborative, hypertext information
systems. This document defines the semantics of HTTP/1.1 messages,
as expressed by request methods, request header fields, response
status codes, and response header fields, along with the payload of
messages (metadata and body content) and mechanisms for content
negotiation.
RFC 7231 HTTP/1.1 Semantics and Content June 2014
6.6.3. 502 Bad Gateway
The 502 (Bad Gateway) status code indicates that the server, while
acting as a gateway or proxy, received an invalid response from an
inbound server it accessed while attempting to fulfill the request.
Fielding & Reschke Standards Track [Page 63]