Soap (simple Object Access Protocol)

簡單的說，soap是web應用之間進行信息傳輸的一種基於XML的信息格式，，一條soap消息就是一個XML文本，而且這個XML文本有基本的格式規定。

soap消息格式

<SOAP-ENV:Envelope [屬性] >
	<SOAP:HEADER>
	...
	</SOAP:HEADER>
	<SOAP:Body>
	</SOAP:Body>
</SOAP-ENV:Envelope>

舉個例子

POST /InStock HTTP/1.1
Host: www.example.org
Content-Type: application/soap+xml; charset=utf-8
Content-Length: nLength

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

  <soap:Body xmlns:m="http://www.example.org/stock">
    <m:GetStockPrice>
      <m:StockName>IBM</m:StockName>
    </m:GetStockPrice>
  </soap:Body>
  
</soap:Envelope>