http1connection.py 文件源码

def _format_chunk(self, chunk):
        if self._expected_content_remaining is not None:
            self._expected_content_remaining -= len(chunk)
            if self._expected_content_remaining < 0:
                # Close the stream now to stop further framing errors.
                self.stream.close()
                raise httputil.HTTPOutputError(
                    "Tried to write more data than Content-Length")
        if self._chunking_output and chunk:
            # Don't write out empty chunks because that means END-OF-STREAM
            # with chunked encoding
            return utf8("%x" % len(chunk)) + b"\r\n" + chunk + b"\r\n"
        else:
            return chunk