async def iter_chunks(self, chunk_size=_DEFAULT_CHUNK_SIZE):
        """Return an iterator to yield chunks of chunk_size bytes from the raw
        stream.
        """
        while True:
            current_chunk = await self.read(chunk_size)
            if current_chunk == b"":
                break
            await yield_(current_chunk)
Return an iterator to yield chunks of chunk_size bytes from the raw
        stream.