Configuring endpoint using wsHttpBinding using TransportWithMessageCredentials using protocol HTTP

Question

I have a legacy WCF service with 2 endpoints. One endpoint is configured using basicHttpBinding and it works fine. I would like to configure the other endpoint to use wsHttpBinding and set the security mode to TransportWithMessageCredentials so that I can read the user name using:

string UserName = ServiceSecurityContext.Current.PrimaryIdentity.Name;

The protocol has to be HTTP and not use the secure HTTPS. I found an answer similar to this problem and tried implementing it. This is the web.config file:

<bindings>
    <basicHttpBinding>
      <binding name="myBindingConfiguration1" closeTimeout="00:01:00">
        <security mode="None">
          <transport clientCredentialType="None" />
        </security>
      </binding>
    </basicHttpBinding>
    <wsHttpBinding>
      <binding name="SecureServiceEndpoint"  closeTimeout="00:01:00">
        <security mode="None">
        </security> 
      </binding>  
    </wsHttpBinding>
    <customBinding>
      <binding name="HttpWithAuthentication">
        <security authenticationMode="UserNameOverTransport" allowInsecureTransport="true" />
        <context />
        <!-- needed for durable worklfows -->
        <textMessageEncoding messageVersion="Soap12Addressing10" />
        <httpTransport />
      </binding>
    </customBinding>
  </bindings>
    <services>
      <service behaviorConfiguration="ServiceBehavior" name="Service.Service">
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <endpoint address="insecure" binding="basicHttpBinding" bindingConfiguration="myBindingConfiguration1"
          name="InsecureService" contract="Service.IService" />
        <endpoint address="secure" binding="customBinding" bindingConfiguration="HttpWithAuthentication"
          name="SecureService" contract="Service.ISecureService" />
      </service>
    </services>

When I try to update the service reference, I get the error: messageVersion="Soap12Addressing10" is not a valid instance of type.

According to the MS documentation, this is a valid type. What message version should this attribute be?

I tried removing this attribute and the service reference can be updated but when accessing the secure endpoint, the client application throws an exception: "The provided URI scheme 'http' is invalid; expected 'https'.\r\nParameter name: via".

I have read in the documentation that this approach is not recommended but this is a legacy application and I would like to see if it is possible. If you can tell me why this is not recommended, I will be sure to explain it to my superiors.

UPDATE:

I got the configuration to populate the value,

ServiceSecurityContext.Current.PrimaryIdentity.Name

I created the binding below in the web.config file:

<wsHttpBinding>
  <binding name="PaymentSecureServiceEndpoint"  closeTimeout="00:01:00">
  <security mode="Message">
  </security> 
  </binding>  
</wsHttpBinding>

However, I was expecting the value to be the NAME of the client application and it is my username. Again, the documentation that I have read indicated that this value would be the name of the client application accessing the web service. I tried setting the value of

 webSeviceName.ClientCredentials.UserName.UserName = "Test Client"

to the value of the application's name but that did not work either.

How can I get the name of the application that is accessing the web service?

Thanks.