The default WCF service is SOAP — unless you use webHttpBinding , which is REST (and this is the only RESTful binding so far). To test your SOAP-based services, you can't just go to the URL in your browser — you need to use a SOAP test application like SoapUI or WCF Test Client .
WCF data services and RIA WCF services are based on webHttpBinding and therefore are based on REST. REST services can be tested by simply looking at the URL - you will return XML that can be displayed in your browser (or JSON, which you can save to a file and see)
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