web.py 文件源码

def write(self, chunk):
        """Writes the given chunk to the output buffer.

        To write the output to the network, use the flush() method below.

        If the given chunk is a dictionary, we write it as JSON and set
        the Content-Type of the response to be application/json.
        (if you want to send JSON as a different Content-Type, call
        set_header *after* calling write()).

        Note that lists are not converted to JSON because of a potential
        cross-site security vulnerability.  All JSON output should be
        wrapped in a dictionary.  More details at
        http://haacked.com/archive/2008/11/20/anatomy-of-a-subtle-json-vulnerability.aspx
        """
        if self._finished:
            raise RuntimeError("Cannot write() after finish().  May be caused "
                               "by using async operations without the "
                               "@asynchronous decorator.")
        if isinstance(chunk, dict):
            chunk = escape.json_encode(chunk)
            self.set_header("Content-Type", "application/json; charset=UTF-8")
        chunk = utf8(chunk)
        self._write_buffer.append(chunk)