old_contents: import random
  import yaml
  from flask import jsonify, Response, render_template
  
  
  class Which(object):
  
      def __init__(self, mime_type, args):
          self.mime_type = mime_type
          self.args = args
  
      @property
      def _excuse(self):
          stream = open("excuses.yaml", 'r')
          excuses = yaml.load(stream)
          return random.choice(excuses["excuses"])
  
      def get_response(self):
          if self.mime_type == "application/json":
              return jsonify({
                  "excuse": self._excuse
              }), "/json/"
  
          elif self.mime_type == "application/xml":
              return Response(
                  render_template('xml.xml', excuse=self._excuse),
                  mimetype='text/xml'
              ), "/xml/"
  
          elif self.mime_type == "application/javascript" or "jsonp" in self.args:
              return Response(
                  render_template('jsonp.js', excuse=self._excuse),
                  mimetype='application/javascript'
              ), "/jsonp/"
  
          elif self.mime_type == "text/plain":
              return Response("Hello world", mimetype='text/plain'), "/text/"
  
          else:
              return render_template('html.html', excuse=self._excuse), "/html/"
  
new_contents: import random
  import yaml
  from flask import jsonify, Response, render_template
  
  
  class Which(object):
  
      def __init__(self, mime_type, args):
          self.mime_type = mime_type
          self.args = args
  
      @property
      def _excuse(self):
          stream = open("excuses.yaml", 'r')
          excuses = yaml.load(stream)
          return random.choice(excuses["excuses"])
  
      def get_response(self):
          if self.mime_type == "application/json":
              return jsonify({
                  "excuse": self._excuse
              }), "/json/"
  
          elif self.mime_type == "application/xml":
              return Response(
                  render_template('xml.xml', excuse=self._excuse),
                  mimetype='text/xml'
              ), "/xml/"
  
          elif self.mime_type == "application/javascript" or "jsonp" in self.args:
              return Response(
                  render_template('jsonp.js', excuse=self._excuse),
                  mimetype='application/javascript'
              ), "/jsonp/"
  
          elif self.mime_type == "text/plain":
              return Response(self._excuse, mimetype='text/plain'), "/text/"
  
          else:
              return render_template('html.html', excuse=self._excuse), "/html/"
  
subject: Fix bug with text/plain response