title: Endpoints stopped working with proxy.html error
body: <p>Error I'm getting
  Refused to display 'ah/api/static/proxy.html?jsh=m%3B%2F%2">https://appname.appspot.com/<em>ah/api/static/proxy.html?jsh=m%3B%2F</em>%2…8s_uMxLg#parent=http%3A%2F%2Fappname.appspot.com&amp;rpctoken=....' in a frame because it set 'X-Frame-Options' to 'SAMEORIGIN'. </p>
  
  <p>Everything worked until yesterday. Started browser this morning to access app and got above message. Getting this on other endpoint apps too. Seems to fail when I access the endpoints to get info from the backend.</p>