Panda's Paradise

However, if you use a SOAP header instead of encoding this extra information in the URL, you are no longer bound to one specific transport.
The other problem with URL encoding is that it now tightly binds Web-service–specific data with the transport—in other words, Web-service–specific data is now outside the SOAP envelope and kept at the transport level.
WS-Addressing defines something called an EPR. In its simplest form, an EPR is nothing more than a URL wrapped by some XML elements.

http://localhost/WidgetService

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test, test