一、Event: 'checkContinue'
二、Event: 'checkExpectation'
三、Event: 'clientError'
四、Event: 'close'
五、Event: 'connect'
六、Event: 'connection'
七、Event: 'dropRequest'
八、Event: 'request'
九、Event: 'upgrade'
十、server.close([callback])
十一、server.closeAllConnections()