Working web.config for service.svc

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <services>
     
      <service name="Microsoft.ServiceModel.Samples.CalculatorService" behaviorConfiguration="default">

       
        <endpoint address=""
                  binding="wsHttpBinding"
                  contract="Microsoft.ServiceModel.Samples.ICalculator" />

        
        <endpoint address="mex"
                  binding="mexHttpBinding"
                  contract="IMetadataExchange" />
      </service>
    </services> 
 
 <behaviors>  
  <serviceBehaviors>    
   <behavior name="default">      
    <serviceMetadata httpGetEnabled="true" />    
   </behavior>  
  </serviceBehaviors>
 </behaviors>
  </system.serviceModel>

</configuration>