A year ago I was working with Waheed Hussain who pointed out that the .Net framework includes a Routing namespace which allows you to implement a service router with zero code. Literally. It's an IIS application with no code, just a web.config. Here's an example:
[sourcecode language="xml"]
< ?xml version="1.0"?>
<configuration>
<system.serviceModel>
<routing>
<filters>
<filter name="MatchAll" filterType="MatchAll" />
</filters>
<filtertables>
<filtertable name="MyFilterTable">
<add filterName="MatchAllFilter" endpointName="MyDestinationEndpoint" priority="0"/>
</filtertable>
</filtertables>
</routing>
<services>
<service behaviorConfiguration="routingConfiguration" name="System.ServiceModel.Routing.RoutingService">
<endpoint address="destinationUrl/" binding="basicHttpBinding" name="routerEndpoint1" contract="System.ServiceModel.Routing.IRequestReplyRouter" />
</service>
</services>
<client>
<endpoint name="MyDestinationEndpoint"
address="https://Destination.1.Host.com/destinationUrl/"
binding="basicHttpBinding"
bindingConfiguration="basicHttpBindingWithClientCertificate"
behaviorConfiguration="clientEndpointCredential"
contract="*" />
</client>
<behaviors>
<servicebehaviors>
<behavior name="routingConfiguration">
<routing routeOnHeadersOnly="true" filterTableName="MyFilterTable" />
<servicedebug includeExceptionDetailInFaults="true" />
<servicemetadata httpGetEnabled="true"/>
</behavior>
</servicebehaviors>
<endpointbehaviors>
<behavior name="clientEndpointCredential">
<clientcredentials>
<clientcertificate storeName="My"
storeLocation="LocalMachine"
x509FindType="FindBySubjectName"
findValue="MyClientCertificate" />
</clientcredentials>
</behavior>
</endpointbehaviors>
</behaviors>
<bindings>
<basichttpbinding>
<binding name="basicHttpBindingWithClientCertificate">
<security mode="Transport">
<transport clientCredentialType="Certificate"/>
</security>
</binding>
</basichttpbinding>
</bindings>
<!-- The clever bit - activate with no code needed -->
<servicehostingenvironment>
<serviceactivations>
<add relativeAddress="Destination.1.Host.com.svc"
service="System.ServiceModel.Routing.RoutingService, System.ServiceModel.Routing, version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</serviceactivations>
</servicehostingenvironment>
</system.serviceModel>
<system.web>
<compilation debug="true" targetFramework="4.0" />
</system.web>
<system.net>
<settings>
<servicepointmanager expect100Continue="false" />
</settings>
</system.net>
</configuration>
[/sourcecode]