code: async def copy_to(self, dest, container, buffering = True):
          
          if self.eof:
              await dest.write(u'' if self.isunicode else b'', True)
          elif self.errored:
              await dest.error(container)
          else:
              try:
                  while not self.eof:
                      await self.prepareRead(container)
                      data = self.readonce()
                      try:
                          await dest.write(data, container, self.eof, buffering = buffering)
                      except IOError:
                          break
              except:
                  async def _cleanup():
                      try:
                          await dest.error(container)
                      except IOError:
                          pass
                  container.subroutine(_cleanup(), False)
                  raise
              finally:
                  self.close(container.scheduler)
docs: Coroutine method to copy content from this stream to another stream.