title: Only allow certain domain to access web api
body: <p>I have a web api that I have created. </p>
  
  <p>I want to ensure that only certain domain can access this data, I don't want everyone accessing it. Is this something that is achievable? Is it recommended? How would one go about doing this or can anyone point me into the right direction - articles etc...</p>
  
  <p>Thanks all</p>