How to do API Key Verification for WebHTTP (REST) Services in .NET 4

Recently somebody asked me about doing APIKey verification in .NET 4. Previously in .NET 3.5 we provided the REST Starter Kit which included a fair bit of server side code to enable a collection of RequestInterceptor objects that we showed doing API Key verification. In this post I’ll show you how you can be a ServiceAuthorizationManager in WCF to accomplish the same goal.