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108 Chapter 5 SOAP The SOAP protocol defines an XML message format for Web Services and their clients. Until version 1.1, SOAP was an acronym for Simple Object Access Protocol, but it was turned into a proper name for version 1.2 of the standard. That SOAP starts with the three letters SOA is sheer coincidence. As we just mentioned, the targets of SOAP messages (both services and clients) are not objects in the object-oriented sense, so the acronym was a misnomer anyway. The SOAP message format is very simple. In a message exchange between a client and the HelloWorld service, the request message would look like this: POST /HelloBean HTTP/1.1 Content-Type: text/xml; charset= utf-8 Content-Length: 398 SOAPAction: Host: falcon:8080 This is an actual message as sent over the wire. As you can see, the message has two parts, an HTTP POST request header, and an XML document in the HTTP payload. This XML document is a SOAP envelope, which represents a request. The envelope contains a body element, which in turn contains the hello element that represents the operation call. The reply message is just as simple: HTTP/1.1 200 OK SOAPAction: Content-Type: text/xml;charset=utf-8 Transfer-Encoding: chunked Hello, World!
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