Configuring WCF services to work with both HTTP and HTTPS

1) Write two endpoints for the service, one is for http and another for https.

<services>
    <service behaviorConfiguration="MyServiceBehavior" name="JK.MyService">
      
      <endpoint address="" behaviorConfiguration="WebBehavior" binding="webHttpBinding" bindingConfiguration="webBinding" contract="JK.IMyService">
        <identity>
          <dns value="localhost" />
        </identity>
      </endpoint>

      <endpoint address="" behaviorConfiguration="WebBehavior" binding="webHttpBinding" bindingConfiguration="webBindingHTTPS" contract="JK.IMyService">
        <identity>
          <dns value="localhost" />
        </identity>
      </endpoint>     
      
    </service>
  </services>

2) Enable both httpGetEnabled="True" httpsGetEnabled="true" in serviceBehaviors.

<behaviors>
    
    <serviceBehaviors>      
      <behavior name="MyServiceBehavior">
        <serviceMetadata httpGetEnabled="True" httpsGetEnabled="true"/>
        <serviceDebug includeExceptionDetailInFaults="true" />
      </behavior>      
    </serviceBehaviors>
    
    <endpointBehaviors>
      <behavior name="WebBehavior">
        <webHttp/>
      </behavior>
    </endpointBehaviors>
    
  </behaviors>

3) Write two bindings configurations for http and https. For http give security mode="None" and for https give mode="Transport".

<bindings>
    <webHttpBinding>

      <binding name="webBinding">
        <security mode="None">
          <transport clientCredentialType="None" />
        </security>
      </binding>

      <binding name="webBindingHTTPS">
        <security mode="Transport">
          <transport clientCredentialType="None" />
        </security>
      </binding>

    </webHttpBinding>
  </bindings>

Below are the complete configuration settings in web.config:

<system.serviceModel>
  
  <services>
    <service behaviorConfiguration="MyServiceBehavior" name="JK.MyService">
      
      <endpoint address="" behaviorConfiguration="WebBehavior" binding="webHttpBinding" bindingConfiguration="webBinding" contract="JK.IMyService">
        <identity>
          <dns value="localhost" />
        </identity>
      </endpoint>

      <endpoint address="" behaviorConfiguration="WebBehavior" binding="webHttpBinding" bindingConfiguration="webBindingHTTPS" contract="JK.IMyService">
        <identity>
          <dns value="localhost" />
        </identity>
      </endpoint>

      <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      
    </service>
  </services>
    
  <behaviors>
    
    <serviceBehaviors>      
      <behavior name="MyServiceBehavior">
        <serviceMetadata httpGetEnabled="True" httpsGetEnabled="true"/>
        <serviceDebug includeExceptionDetailInFaults="true" />
      </behavior>      
    </serviceBehaviors>
    
    <endpointBehaviors>
      <behavior name="WebBehavior">
        <webHttp/>
      </behavior>
    </endpointBehaviors>
    
  </behaviors>
  
  <bindings>
    <webHttpBinding>

      <binding name="webBinding">
        <security mode="None">
          <transport clientCredentialType="None" />
        </security>
      </binding>

      <binding name="webBindingHTTPS">
        <security mode="Transport">
          <transport clientCredentialType="None" />
        </security>
      </binding>

    </webHttpBinding>
  </bindings>
  
</system.serviceModel>