title: 400 Error when posting to Google Vision API
body: <p>I had an application using the Google Vision API running fine for nearly a year. It wasn't running for a few months and when I ran it recently, it always returned 400 errors. I went to the account settings and noticed my key was gone. I entered a new one and updated my program. However, it still always gets a 400 error. It does so no matter what key I use (valid or not).</p>
  
  <p>I looks like it isn't accepting the key. </p>
  
  <p>Any idea what the issue might be?
  Any way to test that a key is valid?</p>