title: REST GET requests, verbs and apikey
body: <p>I want to create a flexible API Rest server. I will allow the clients to authenticate using HTTP or an APIKEY. </p>
  
  <p>My question is: what is the correct way to add the apikey to a GET request? My problem is the apikey pollutes the url.</p>
  
  <p>I imagine something like this : /book/1/apikey/s4cr4t ! </p>