SOAP

Also known as Simple Object Access Protocol

SOAP (originally 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.

Key facts

Technology standard.title: SOAP
Technology standard.status: Active
Technology standard.first_published: Initially as XML-RPC in
Technology standard.version: 1.2
Technology standard.domain: Text-based protocol
Technology standard.license: Copyright by W3C, implementations are royalty-free

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Stack Exchange tag: stackoverflow.com/tags/soap
media type: application/soap+xml
described at URL: www.w3.org/TR/soap12

~13 min read

Article

19 sections

Contents

Characteristics
History
SOAP terminology
Protocol concepts
Data encapsulation concepts
Message sender and receiver concepts
Specification
SOAP building blocks
Transport methods
Message format
Example message (encapsulated in HTTP)
Technical critique
Advantages
Disadvantages
See also
Notes
References
Further reading
External links

==Characteristics== SOAP provides the Messaging Protocol layer of a web services protocol stack for web services. It is an XML-based protocol consisting of three parts: an envelope, which defines the message structure and how to process it a set of encoding rules for expressing instances of application-defined datatypes a convention for representing procedure calls and responses