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<title>WS-Addressing</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">WS-Addressing</span></span>

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<p><b>Web Services Addressing</b> (<b>WS-Addressing</b>) is a specification of transport-neutral mechanism that allows <a href="Web_service" title="Web service">web services</a> to communicate addressing information. It essentially consists of two parts: a structure for communicating a reference to a Web service endpoint, and a set of message addressing properties which associate addressing information with a particular message.

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<div class="mw-heading mw-heading2"><h2 id="Description">Description</h2></div>

<p>WS-Addressing is a standardized way of including message routing data within <a href="SOAP" title="SOAP">SOAP</a> headers. Instead of relying on network-level transport to convey routing information, a message utilizing WS-Addressing may contain its own dispatch metadata in a standardized SOAP header. The network-level transport is only responsible for delivering that message to a dispatcher capable of reading the WS-Addressing metadata. Once that message arrives at the dispatcher specified in the URI, the job of the network-level transport is done.

</p><p>WS-Addressing supports the use of asynchronous interactions by specifying a common SOAP header (wsa:ReplyTo) that contains the endpoint reference (EPR) to which the response is to be sent. The service provider transmits the response message over a separate connection to the wsa:ReplyTo endpoint. This decouples the lifetime of the SOAP request/response interaction from the lifetime of the HTTP request/response protocol, thus enabling long-running interactions that can span arbitrary periods of time.

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<div class="mw-heading mw-heading2"><h2 id="Endpoint_references">Endpoint references</h2></div>

<p>An endpoint reference (EPR) is an <a href="XML" title="XML">XML</a> structure encapsulating information useful for addressing a message to a Web service. This includes the destination address of the message, any additional parameters (called reference parameters) necessary to route the message to the destination, and optional metadata (such as <a href="Web_Services_Description_Language" title="Web Services Description Language">WSDL</a> or <a href="WS-Policy" title="WS-Policy">WS-Policy</a>) about the service.

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<div class="mw-heading mw-heading2"><h2 id="Message_addressing_properties">Message addressing properties</h2></div>

<p>Message addressing properties communicate addressing information relating to the delivery of a message to a Web service:

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<ul><li>Message destination <a href="Uniform_Resource_Identifier" title="Uniform Resource Identifier">URI</a></li>

<li>Source endpoint -- the endpoint of the service that dispatched this message (EPR)</li>

<li>Reply endpoint -- the endpoint to which reply messages should be dispatched (EPR)</li>

<li>Fault endpoint -- the endpoint to which fault messages should be dispatched (EPR)</li>

<li>Action -- an action value indicating the semantics of the message (may assist with routing the message) <a href="Uniform_Resource_Identifier" title="Uniform Resource Identifier">URI</a></li>

<li>Unique message ID <a href="Uniform_Resource_Identifier" title="Uniform Resource Identifier">URI</a></li>

<li>Relationship to previous messages (A pair of <a href="Uniform_Resource_Identifier" title="Uniform Resource Identifier">URIs</a>)</li></ul>

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>WS-Addressing was originally authored by <a href="Microsoft" title="Microsoft">Microsoft</a>, <a href="IBM" title="IBM">IBM</a>, <a href="BEA_Systems" title="BEA Systems">BEA</a>, <a href="Sun_Microsystems" title="Sun Microsystems">Sun Microsystems</a>, and <a href="SAP_AG" class="mw-redirect" title="SAP AG">SAP</a> and submitted to <a href="W3C" class="mw-redirect" title="W3C">W3C</a> for standardization.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The W3C WS-Addressing Working Group has refined and augmented the specification in the process of standardization.

</p><p>WS-Addressing is currently specified in three parts:

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<ul><li>The <a rel="nofollow" class="external text" href="http://www.w3.org/TR/ws-addr-core">Core</a> specification of Endpoint References and Message Addressing Properties.</li>

<li>A <a rel="nofollow" class="external text" href="http://www.w3.org/TR/ws-addr-soap">binding</a> of these properties to <a href="SOAP" title="SOAP">SOAP</a>.</li>

<li>The <a rel="nofollow" class="external text" href="http://www.w3.org/TR/ws-addr-metadata/">Metadata</a> specification defines how the abstract properties defined in <a rel="nofollow" class="external text" href="http://www.w3.org/TR/ws-addr-core">Core</a> are described using <a href="Web_Services_Description_Language" title="Web Services Description Language">WSDL</a>, how to include WSDL metadata in endpoint references, and how <a href="WS-Policy" title="WS-Policy">WS-Policy</a> can be used to indicate the support of WS-Addressing by a Web service.</li></ul>

<p><a rel="nofollow" class="external text" href="http://www.w3.org/Submission/WS-PAEPR/">Web Services Policy Attachment for Endpoint Reference (WS-PAEPR)</a> specifies the mechanism and meaning of including <a href="WS-Policy" title="WS-Policy">WS-Policy</a> expressions in Endpoint References. WS-PAEPR is a W3C Member Submission.

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.w3.org/Submission/2004/SUBM-ws-addressing-20040810/">"Web Services Addressing (WS-Addressing)"</a>.</cite></span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><a rel="nofollow" class="external text" href="http://www.w3.org/2002/ws/addr/">Web Services Addressing Working Group</a></li>

<li><a rel="nofollow" class="external text" href="http://www.w3.org/Submission/2004/05/">WS-Addressing - Submission Request to W3C</a></li>

<li><a rel="nofollow" class="external text" href="http://www.w3.org/Submission/2004/05/Comment">Team Comment on the WS-Addressing Submission</a></li></ul></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2022-01-13" href="https://en.wikipedia.org/wiki/?title=WS-Addressing&oldid=1065395995">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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