old_contents: """
  Module for a Response object.
  
  A Response is returned by Routes when the underlying coroutine is done.
  """
  from http_parser.util import IOrderedDict
  
  from .util import HTTP_CODES
  
  
  class Response(object):
      """
      A response is responsible (no pun intended) for delivering data to the client, again.
  
      The method `to_bytes()` transforms this into a bytes response.
      """
  
      def __init__(self, code: int, body: str, headers: dict):
          """
          Create a new response.
          """
          self.code = code
          self.body = str(body)
          self.headers = IOrderedDict(headers)
  
      def _recalculate_headers(self):
          """
          Override certain headers, like Content-Size.
          """
          self.headers["Content-Length"] = len(self.body)
  
      def to_bytes(self):
          """
          Return the correct response.
          """
          self._recalculate_headers()
          fmt = "HTTP/1.1 {code} {msg}\r\n{headers}\r\n\r\n{body}\r\n"
          headers_fmt = ""
          # Calculate headers
          for name, val in self.headers.items():
              headers_fmt += "{}: {}".format(name, val)
          built = fmt.format(code=self.code, msg=HTTP_CODES.get(self.code, "Unknown"), headers=headers_fmt,
                             body=self.body)
  
          return built.encode()
  
new_contents: """
  Module for a Response object.
  
  A Response is returned by Routes when the underlying coroutine is done.
  """
  from http_parser.util import IOrderedDict
  
  from .util import HTTP_CODES
  
  
  class Response(object):
      """
      A response is responsible (no pun intended) for delivering data to the client, again.
  
      The method `to_bytes()` transforms this into a bytes response.
      """
  
      def __init__(self, code: int, body: str, headers: dict):
          """
          Create a new response.
          """
          self.code = code
          self.body = str(body)
          self.headers = IOrderedDict(headers)
  
      def _recalculate_headers(self):
          """
          Override certain headers, like Content-Size.
          """
          self.headers["Content-Length"] = len(self.body)
          if 'Content-Type' not in self.headers:
              self.headers["Content-Type"] = "text/plain"
  
      def to_bytes(self):
          """
          Return the correct response.
          """
          self._recalculate_headers()
          fmt = "HTTP/1.1 {code} {msg}\r\n{headers}\r\n{body}\r\n"
          headers_fmt = ""
          # Calculate headers
          for name, val in self.headers.items():
              headers_fmt += "{}: {}\r\n".format(name, val)
          built = fmt.format(code=self.code, msg=HTTP_CODES.get(self.code, "Unknown"), headers=headers_fmt,
                             body=self.body)
  
          return built.encode()
  
subject: Add \r\n to the end of each header too