and clients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 5.4 Asynchronous networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starts serving requests on this connection. Parameters delegate – a HTTPServerConnectionDelegate 5.4 Asynchronous networking 5.4.1 tornado.ioloop — Main event loop An I/O event loop for non-blocking Atypical applications may use more than one IOLoop, such as one IOLoop per thread, or per unittest case. 5.4. Asynchronous networking 93 Tornado Documentation, Release 5.1.1 In addition to I/O events, the IOLoop