Enabling mex for http://stevenhollidge.blogspot.co.uk/2011/03/how-to-create-json-wcf-restful-service.html

gistfile1.mustache

<?xml version="1.0"?>
<configuration>
  <system.serviceModel>
	<services>
	  <service name="WcfJsonRestService.Service1" behaviorConfiguration="MyServiceBehavior">
		  <endpoint address="" binding="webHttpBinding" contract="WcfJsonRestService.IService1"/>
      <host>
        <baseAddresses>
          <add baseAddress="http://localhost:8732/service1" />
        </baseAddresses>
      </host>
    </service>
	</services>
  <behaviors>
    <serviceBehaviors>
      <behavior name="MyServiceBehavior">
        <!-- serviceMetadata enables our mex endpoint -->
        <serviceMetadata httpGetEnabled="true"/>
        <serviceDebug includeExceptionDetailInFaults="true" />
      </behavior>
    </serviceBehaviors>
    <endpointBehaviors>
      <behavior>
        <!-- webHttp enables our service for http GET -->
        <webHttp />
      </behavior>
    </endpointBehaviors>
	</behaviors>
  </system.serviceModel>
  <startup>
	<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>
</configuration>