SOAP

This article is about the computer network protocol. For the IBM 650 assembly language, see Symbolic Optimal Assembly Program. For surfactants used for cleaning, see Soap. For other uses, see Soap (disambiguation).
Internet protocol suite
Application layer
Transport layer
Internet layer
Link layer
SOAP
FamilyMessaging protocol
Designed by
First appearedInitially as XML-RPC in June 1998; 26 years ago (June 1998)
Stable release
1.2 / 27 April 2007; 17 years ago (2007-04-27)

SOAP (formerly an acronym for Simple Object Access Protocol) is a messaging protocol specification for exchanging structured information in the implementation of web services in computer networks. It uses XML Information Set for its message format, and relies on application layer protocols, most often Hypertext Transfer Protocol (HTTP), although some legacy systems communicate over Simple Mail Transfer Protocol (SMTP), for message negotiation and transmission.