Accept Headers

1. Assert that a GET request to "/api/level17" returns a 200 status code.
2. Assert that a GET request to "/api/level17" with a header of "Accept" with a value of "text/plain" returns the response:

   Here's some plain text!

3. Assert that a GET request to "/api/level17" with header of "Accept" with a value of "application/json" returns the response:

   {
     "Hereees": "json!"
   }

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