web.py 文件源码

def clear(self):
        """Resets all headers and content for this response."""
        # The performance cost of tornado.httputil.HTTPHeaders is significant
        # (slowing down a benchmark with a trivial handler by more than 10%),
        # and its case-normalization is not generally necessary for 
        # headers we generate on the server side, so use a plain dict
        # and list instead.
        self._headers = {
            "Server": "TornadoServer/%s" % tornado.version,
            "Content-Type": "text/html; charset=UTF-8",
        }
        self._list_headers = []
        self.set_default_headers()
        if not self.request.supports_http_1_1():
            if self.request.headers.get("Connection") == "Keep-Alive":
                self.set_header("Connection", "Keep-Alive")
        self._write_buffer = []
        self._status_code = 200