old_contents: import ujson
  
  
  def application(environ, start_response):
      response = {
        "message": "Hello, World!"
      }
      data = ujson.dumps(response)
      response_headers = [
          ('Content-type', 'text/plain'),
          ('Content-Length', str(len(data)))
      ]
      start_response('200 OK', response_headers)
      return [data]
  
new_contents: import ujson
  
  
  def application(environ, start_response):
      response = {
        "message": "Hello, World!"
      }
      data = ujson.dumps(response)
      response_headers = [
          ('Content-type', 'application/json'),
          ('Content-Length', str(len(data)))
      ]
      start_response('200 OK', response_headers)
      return [data]
  
subject: Fix test to use proper Content-type for json test