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The header mechanism in SOAP, imprecisely conceived and defined, was intended for use by specific applications built atop the base protocol, providing a place in which to define SOAP extensions Of course, for such extensions to be generally meaningful, they need to be standardized This is part of the work that needs to be done to complete Web services: to define standard SOAP headers for security, transactions, process flow, routing, message correlation, guaranteed message delivery, and so on However, until
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one or more other W3C working groups start to define standards for them, SOAP headers are likely to remain confusing and ill-defined There is no compelling reason yet to use them Application-specific information can just as easily be carried in the SOAP body Headers include an attribute called mustUnderstand, which allows senders and receivers to negotiate agreement on support of a given header or set of headers This attribute is the same as the mandatory attribute in the HTTP Extension Framework, to which the SOAP specification also provides a mapping Thus the mustUnderstand attribute, like many other aspects of SOAP, is a carryover of a concept defined originally in HTTP The intent of this concept is to allow applications built using the older versions of the specification, or the applications not up to the same revision level as new applications, to fail gracefully when they receive a message that they do not understand For example:
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<SOAP-ENV:Header> <t:Transaction xmlns:t="wwwxmlbuscom" SOAP-ENV:mustUnderstand="1"> 5 </t:Transaction> </SOAP-ENV:Header>
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A sender can require the receiver to understand a header
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The example shows a possible header for transaction support, which is not yet defined, that uses the mustUnderstand attribute to require the receiver to support transactions if the sender wants to use them If the receiver of the SOAP message doesn't support transactions, the receipt of such a message will generate a SOAP fault Headers can require SOAP processors to understand them or to reject the message
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When a header block is tagged with a SOAP mustUnderstand attribute with a value of 1 or True, the targeted SOAP node must process the SOAP block according to the requirements of the header or not process the SOAP message at all and return an error code Headers are for adding features to a SOAP message in a decentralized manner without prior agreement between the communicating parties But SOAP does not define any headers, and it's not clear which headers will be used, although SOAP does define some attributes for use with the headers in anticipation of such use Headers allow decentralized addition of features to SOAP
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In designing the headers, the specification authors anticipated that a wide variety of header functions would be developed over time Each SOAP node may include the software necessary to implement one or more such extensions A SOAP header block is understood by a receiving
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SOAP node if the software at that SOAP node has been written to fully implement the semantics conveyed by the fully qualified name of the outermost element of that block, that is, by the semantics defined in the associated schema for that element name
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SOAP Body
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The SOAP body contains the application-defined XML data being exchanged in the SOAP message The body must be contained within the envelope and must follow any headers that might be defined for the message The body is defined as a child element of the envelope, and the semantics for the body are defined in the associated SOAP schema The body contains information that must be sent to the ultimate recipient
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The body contains mandatory information intended for the ultimate receiver of the message For example:
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Request <SOAP-ENV:Envelope <SOAP-ENV:Body> <m:GetOrderStatus xmlns:m="wwwxmlbuscom/OrderEntry"> <orderno>12345</orderno> </m:GetOrderStatus> </SOAP-ENV:Body>
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</SOAP-ENV:Envelope> Response <SOAP-ENV:Envelope <SOAP-ENV:Body> <m:GetOrderStatusResponse xmlns:m="wwwxmlbuscom/OrderEntry"> <status>shipped June 18</status> </m:GetOrderStatusResponse> </SOAP-ENV:Body>
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