SOAP이란?

w3cschool의 자료를 참고해서 SOAP의 개념에 대해 학습을 진행했다. 

웬만한 한글로 된 자료보다 깔끔하게 정리가 되어 있어 부족한 영어실력을 가지고도 그럭저럭 이해할 정도는 되었다. 

XML Soap

Simple Object Access Protocol

application communication protocol

format for sending and receiving messages

based on XML and W3C recommendation

 

Why SOAP?

impotant for web app to be able to communicate over the Internet

SOAP provides a way to comm between app running on different OS, with different Tech and Programming languages

 

SOAP Building Blocks

SOAP 메시지는 XML로 되어있고 이는 아래 요소를 따른다

An Envelope element that identifies the XML document as a SOAP message

A Header element that contains header info

A Body element that contains call and response info

A Fault element containing errors and status info

 

SOAP 봉투의 티폴트 namespace는

http://www.w3.org/2003/05/soap-envelope

SOAP 인코딩, 데이터 타입을 위한 namespace는

http://www.w3.org/2003/05/soap-encoding

 

Syntax Rules(문법, 구문 오류)

Must be Encoded using XML

Must use the SOAP Envelope namespace

Must use the SOAP Encoding namespace

Must Not contain DTD reference (문서형식정의?)

Must not contain XML Processing Instructions???

 

Skeleton SOAP Message

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<?xml version=”1.0”?>   <soap:Envelope xmlns:soap=http://www.w3.org/2003/05/soap-envelope soap:encodingStyle=”http://www.w3.org/2003/05/soap-encoding” >

/* SOAP Header Element

 soap defines three attributes in the default namespace(mustUnderstand, actor, encodingStyle)

*/

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<soap:Header>            <m:Trans xmlns:m=http://www.w3schools.com/transaction/            Soap:mustUnderstand=”1”>234 or            Soap:actor=”URL”>234            </m:Trans> </soap:Header>

 

/* SOAP Body Element

The required SOAP Body element contains the actual SOAP message intended for the ultimate endpoint of the message.

*/

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<soap:Body>            <m:GetPrice xmlns:m=http://www.w3schools.com/prices>              <m:Item>Apples</m:Item>            </m:GetPrice> </soap:Body>

à A SOAP response could look something like this

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<soap:Body>            <m:GetPriceResponse xmlns:m=http://www.w3schools.com/prices>              <m:Price>1.90</m:Price>            </m:GetPriceResponse> </soap-Body>

 

/* The SOAP Fault Element

 The optional SOAP Fault element is used to indicate error messages

 (faultcode, faultstring, faultactor, detail)

 SOAP Fault Codes : VersionMisMatch, MustUnderstand, Client, Server

*/

</soap-Envelope>

 

The HTTP Protocol

HTTP communicates over TCP/IP.