title: What problems may using the MIME type application/json cause?
body: <p>I am working on  a web service the needs to return JSON data.  <a href="https://stackoverflow.com/questions/477816/the-right-json-content-type">I read that I should use application/json</a> but am not sure what problems this may cause?</p>
  
  <p>For example, will older browsers support it? (IE6+, FF, Opera, etc.)</p>
  
  <p>Or is it possible that users behind corporate firewalls/proxy servers block the mime type application/json?</p>
  
  <p>What, if any, problems have you had following this advice?</p>