def seekable(self):
        if self.closed:
            raise ValueError("I/O operation on closed socket.")
        return super().seekable()
Tests that that handler only accepts AJAX requests.
dataset/ETHPy150Open OpenCobolIDE/OpenCobolIDE/open_cobol_ide/extlibs/future/backports/socket.py/SocketIO.seekable--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/appengine-mapreduce/python/test/mapreduce/handlers_test.py/StartJobHandlerTest.testCSRF