code: def iter_content(self, chunk_size=10 * 1024, decode_unicode=None):
          
          if self._content_consumed:
              raise RuntimeError(
                  'The content for this response was already consumed'
              )
  
          def generate():
              while 1:
                  chunk = self.raw.read(chunk_size)
                  if not chunk:
                      break
                  yield chunk
              self._content_consumed = True
  
          gen = generate()
  
          if 'gzip' in self.headers.get('content-encoding', ''):
              gen = stream_decode_gzip(gen)
  
          if decode_unicode is None:
              decode_unicode = self.config.get('decode_unicode')
  
          if decode_unicode:
              gen = stream_decode_response_unicode(gen, self)
  
          return gen
docs: Iterates over the response data.  This avoids reading the content
          at once into memory for large responses.  The chunk size is the number
          of bytes it should read into memory.  This is not necessarily the
          length of each item returned as decoding can take place.