What is so wrong about the string \"con\"?
OK, my api route configuration is rather uninteresting:
config.Routes.MapHttpRoute( name: \"DefaultApi
Certain keywords are not allowed in the URL and CON is one of them. See this. The workaround is to include the following under <system.web> in your Web.config.
<system.web>
<httpRuntime relaxedUrlToFileSystemMapping="true" />