483 

   483 

   484         if (

   484         if (

   485             self._bodybytes is None

   485             self._bodybytes is None

   486             and self._bodygen is None

   486             and self._bodygen is None

   487             and not self._bodywillwrite

   487             and not self._bodywillwrite

   488         ):

   489         ):

   489             raise error.ProgrammingError(b'response body not defined')

   490             raise error.ProgrammingError(b'response body not defined')

   490 

   491 

   491         # RFC 7232 Section 4.1 states that a 304 MUST generate one of

   492         # RFC 7232 Section 4.1 states that a 304 MUST generate one of

   492         # {Cache-Control, Content-Location, Date, ETag, Expires, Vary}

   493         # {Cache-Control, Content-Location, Date, ETag, Expires, Vary}

   592                     chunk = bytes(chunk)

   593                     chunk = bytes(chunk)

   593 

   594 

   594                 yield chunk

   595                 yield chunk

   595         elif self._bodywillwrite:

   596         elif self._bodywillwrite:

   596             self._bodywritefn = write

   597             self._bodywritefn = write

   597         else:

   600         else:

   598             error.ProgrammingError(b'do not know how to send body')

   601             error.ProgrammingError(b'do not know how to send body')

   599 

   602 

   600     def getbodyfile(self):

   603     def getbodyfile(self):

   601         """Obtain a file object like object representing the response body.

   604         """Obtain a file object like object representing the response body.