title: postman post request for Azure FormRecognizer does not work
body: <p>I am trying to follow the instructions <a href="https://westus2.dev.cognitive.microsoft.com/docs/services/form-recognizer-api/operations/AnalyzeWithCustomModel" rel="nofollow noreferrer">here</a> to analyze a form. I have already trained a model and it works when I use the python code. Now, I would like to be able to get the results also per <code>postman</code> but it doesn't work.</p>
  <p>You can see my post request here:
  <a href="https://i.stack.imgur.com/urgBJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/urgBJ.png" alt="enter image description here" /></a>
  <a href="https://i.stack.imgur.com/m5a6I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/m5a6I.png" alt="enter image description here" /></a></p>
  <p>As you see, I have added the <code>Content-Type</code> and the <code>Ocp-Apim-Subscription-Key</code>. However, I don't get any <code>json</code> as the answer, though I get <code>status: 202 Accepted</code>.</p>
  <p>Can anybody tell me, what I have done wrong?</p>
  <p>Thanks in advance,</p>