This is a SockJS hidden iframe. It's used for cross domain magic.
'''.strip() class IFrameHandler(BaseHandler): """SockJS IFrame page handler""" def get(self): data = str_to_bytes(IFRAME_TEXT % self.server.settings['sockjs_url']) hsh = hashlib.md5(data).hexdigest() value = self.request.headers.get('If-None-Match') if value: if value.find(hsh) != -1: # TODO: Fix me? Right now it is a hack to remove content-type # header self.clear() del self._headers['Content-Type'] self.set_status(304) return self.enable_cache() self.set_header('Etag', hsh) self.write(data) class GreetingsHandler(BaseHandler): """SockJS greetings page handler""" def initialize(self, server): self.server = server def get(self): self.enable_cache() self.set_header('Content-Type', 'text/plain; charset=UTF-8') self.write('Welcome to SockJS!\n') class ChunkingTestHandler(PreflightHandler): """SockJS chunking test handler""" # Step timeouts according to sockjs documentation steps = [0.005, 0.025, 0.125, 0.625, 3.125] def initialize(self, server): self.server = server self.step = 0 self.io_loop = server.io_loop @asynchronous def post(self): self.preflight() self.set_header('Content-Type', 'application/javascript; charset=UTF-8') # Send one 'h' immediately self.write('h\n') self.flush() # Send 2048 spaces followed by 'h' self.write(' ' * 2048 + 'h\n') self.flush() # Send 'h' with different timeouts def run_step(): try: self.write('h\n') self.flush() self.step += 1 if self.step < len(self.steps): self.io_loop.add_timeout(time.time() + self.steps[self.step], run_step) else: self.finish() except IOError: pass self.io_loop.add_timeout(time.time() + self.steps[0], run_step) class InfoHandler(PreflightHandler): """SockJS 0.2+ /info handler""" def initialize(self, server): self.server = server self.access_methods = 'OPTIONS, GET' def get(self): self.preflight() self.disable_cache() self.set_header('Content-Type', 'application/json; charset=UTF-8') options = dict(websocket=self.server.websockets_enabled, cookie_needed=self.server.cookie_needed, origins=['*:*'], entropy=random.randint(0, MAXSIZE)) self.write(json_encode(options))