tornado websockets ioloop异常

Question

我正在尝试让tornado的websockets文档中的hello-world示例运行起来。我对tornado还很陌生，对websockets更是一无所知。我按照文档直接指定了以下处理程序：

class EchoWebSocket(tornado.websocket.WebSocketHandler):
    def open(self):
        print "WebSocket opened"

    def on_message(self, message):
        self.write_message(u"You said: " + message)

    def on_close(self):
        print "WebSocket closed"

然后通过javascript调用它，使用的是

var ws = new WebSocket("ws://localhost:6665/websocket");
ws.onopen = function() {
   ws.send("Hello, world");
};
ws.onmessage = function (evt) {
   alert(evt.data);
};

同样是直接来自文档的内容。不过，我立刻遇到了三个异常：

[E 111123 17:45:54 iostream:233] Uncaught exception, closing connection.
    Traceback (most recent call last):
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers
        self.request_callback(self._request)
      File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__
        handler = spec.handler_class(self, request, **spec.kwargs)
    TypeError: default __new__ takes no parameters
[E 111123 17:45:54 iostream:221] Uncaught exception, closing connection.
    Traceback (most recent call last):
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 199, in _handle_events
        self._handle_read()
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 258, in _handle_read
        if self._read_from_buffer():
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 325, in _read_from_buffer
        self._consume(loc + delimiter_len))
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers
        self.request_callback(self._request)
      File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__
        handler = spec.handler_class(self, request, **spec.kwargs)
    TypeError: default __new__ takes no parameters
[E 111123 17:45:54 ioloop:281] Exception in I/O handler for fd 4
    Traceback (most recent call last):
      File "/local/lib/python2.5/site-packages/tornado/ioloop.py", line 269, in start
        self._handlers[fd](fd, events)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 199, in _handle_events
        self._handle_read()
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 258, in _handle_read
        if self._read_from_buffer():
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 325, in _read_from_buffer
              self._consume(loc + delimiter_len))
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers
        self.request_callback(self._request)
      File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__
        handler = spec.handler_class(self, request, **spec.kwargs)
    TypeError: default __new__ takes no parameters

我承认我无法正确理解这些异常，而且我对深入研究tornado.web感到有些紧张。我是不是做错了什么明显的事情？我使用的是tornado 1.2.1版本。

异常处理网络编程版本兼容性事件驱动 websockets tornado ioloop

tornado websockets ioloop异常

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