title: How do I determine if a HTTP request came from a browser or something else like a web service?
body: <p>How do I determine if a HTTP request came from a browser or something else like a web service?</p>
  
  <p>I am aware that there is a User Agent, but this seems mainly for web browsers.  For instance I do I know the request came from a google maps or youtube.  The request are coming off a tethered device.</p>
  
  <p>If they have a different User Agent, can I get an example.</p>
  
  <p>Thanks.</p>