Question

这是错误日志：

[I 160308 11:09:59 web：1908] 200 GET / admin / realtime（117.93.180.216）107.13ms [E 160308 11:09:59 http1connection：54]未捕获的异常 Traceback（最近一次调用最后一次）：文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/http1connection.py" ;,第238行，在_read_message中 delegate.finish（）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/httpserver.py" ;,第290行，完成 self.delegate.finish（）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py" ;, 1984年，完成 self.execute（）文件＆＃34; /usr/local/lib/python3.4/dist-packages/blueware-1.0.10/blueware/hooks/framework_tornado/web.py"，第480行，_bw_wrapper__RequestDispatcher_execute future = wrapped（* args，** kwargs）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py" ;,第2004行，执行 ** self.handler_kwargs）文件＆＃34; /usr/local/lib/python3.4/dist-packages/blueware-1.0.10/blueware/hooks/framework_tornado/web.py"，第448行，在_bw_wrapper_RequestHandler___init___中返回包裹（* args，** kwargs）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py" ;,第185行， init self.initialize（** kwargs）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py" ;,第2714行，在包装器中 self.redirect（URL）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py"，第671行，重定向 self.finish（）文件＆＃34; /usr/local/lib/python3.4/dist-packages/blueware-1.0.10/blueware/hooks/framework_tornado/web.py" ;,第309行，在_bw_wrapper_RequestHandler_finish_中返回包裹（* args，** kwargs）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py" ;,第934行，完成 self.flush（include_footers =真）文件＆＃34; /usr/local/lib/python3.4/dist-packages/tornado/web.py" ;,第870行，同花顺 for self._transforms中的变换： TypeError：＆＃39; NoneType＆＃39;对象不可迭代 [I 160308 11:10:00 web：1908] 200 GET / admin / order？order_type = 1＆amp; order_status = 1＆amp; page = 0＆amp; action = allreal（49.89.27.173）134.53ms

谁能告诉我如何解决这个问题？非常感谢你

Answer 1

我认为OneAPM（蓝色代理）与你的python和Tornado版本兼容，但它可能很棘手。

解决方案

将self.redirect(url)从您的处理程序initialize方法移至get方法，就像这样

class MyHandler(tornado.web.RequestHandler):
    def get(self):
        self.redirect('/some_url')

或使用RedirectHandler。

每个可以完成请求的操作都需要在http-verb方法（get，post，put等）的上下文中调用。 common mistake正在__init__或initialize进行认证/授权。

重现

触发此错误的示例。我只是将其作为交叉检查，包括蓝色软件不是原因：

import tornado.ioloop
import tornado.web

class SomeHandler(tornado.web.RequestHandler):

    def initialize(self, *args, **kwargs):
        url = '/some'
        self.redirect(url) 
        # ^ this is wrong

    def get(self):
        # redirect should be here
        self.write("Hello")


def make_app():
    return tornado.web.Application([
        (r"/", SomeHandler),
    ])

if __name__ == "__main__":
    app = make_app()
    app.listen(8888)
    tornado.ioloop.IOLoop.current().start()

和stacktrace：

ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
  File "/tmp/py3/lib/python3.4/site-packages/tornado/http1connection.py", line 238, in _read_message
    delegate.finish()
  File "/tmp/py3/lib/python3.4/site-packages/tornado/httpserver.py", line 289, in finish
    self.delegate.finish()
  File "/tmp/py3/lib/python3.4/site-packages/tornado/web.py", line 2022, in finish
    self.execute()
  File "/tmp/py3/lib/python3.4/site-packages/tornado/web.py", line 2042, in execute
    **self.handler_kwargs)
  File "/tmp/py3/lib/python3.4/site-packages/tornado/web.py", line 183, in __init__
    self.initialize(**kwargs)
  File "test.py", line 8, in initialize
    self.redirect(url)
  File "/tmp/py3/lib/python3.4/site-packages/tornado/web.py", line 666, in redirect
    self.finish()
  File "/tmp/py3/lib/python3.4/site-packages/tornado/web.py", line 932, in finish
    self.flush(include_footers=True)
  File "/tmp/py3/lib/python3.4/site-packages/tornado/web.py", line 868, in flush
    for transform in self._transforms:
TypeError: 'NoneType' object is not iterable

我用龙卷风写了一个项目，但是这个例外总是在我的日志文件中

1 个答案:

解决方案

更多细节

重现