[英]Custom 404 Errorpage with Python tornado
I'm trying to implement a custom 404 page with python tornado.我正在尝试使用 python 龙卷风实现自定义 404 页面。 The docs say: "
default_handler_class
and default_handler_args
: This handler will be used if no other match is found; use this to implement custom 404 pages (new in Tornado 3.2).".文档说:“
default_handler_class
和default_handler_args
:如果没有找到其他匹配项,将使用此处理程序;使用它来实现自定义 404 页面(Tornado 3.2 中的新功能)。”。 There is no good information about how the handler needs to work.没有关于处理程序需要如何工作的好信息。 I tried using this code:
我尝试使用此代码:
class defaultHandler(tornado.web.RequestHandler):
def __init__(self, arg2, arg3):
print("Called default handler")
self.arg2 = arg2
self.arg3 = arg3
def get(self):
self.write("404 - my thing")
Using this tornado config:使用这个龙卷风配置:
return tornado.web.Application([
(r"/main", MainHandler),
(r"/update_kurse", updateCallback),
(r"/", LoginPage),
], static_path=os.path.join(os.path.dirname(__file__), "static"),
template_path=os.path.join(os.path.dirname(__file__), "templates"),
default_handler_class=defaultHandler)
This results in an error:这会导致错误:
ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\http1connection.py", line 273, in _read_message
delegate.finish()
File "C:\Users\******\lib\site-packages\tornado\routing.py", line 268, in finish
self.delegate.finish()
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2297, in finish
self.execute()
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2337, in execute
return self.handler._prepared_future
AttributeError: 'defaultHandler' object has no attribute '_prepared_future'
ERROR:tornado.application:Error in exception logger
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1752, in _handle_request_exception
self.log_exception(*sys.exc_info())
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1790, in log_exception
self._request_summary(),
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1740, in _request_summary
self.request.method,
AttributeError: 'function' object has no attribute 'method'
ERROR:tornado.application:Exception in exception handler
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1708, in _execute
self._handle_request_exception(e)
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1757, in _handle_request_exception
if self._finished:
AttributeError: 'defaultHandler' object has no attribute '_finished'
ERROR:asyncio:Exception in callback _HandlerDelegate.execute.<locals>.<lambda>(<Task finishe...ed_future'",)>) at C:\Users\******\lib\site-packages\tornado\web.py:2333
handle: <Handle _HandlerDelegate.execute.<locals>.<lambda>(<Task finishe...ed_future'",)>) at C:\Users\******\lib\site-packages\tornado\web.py:2333>
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\asyncio\events.py", line 145, in _run
self._callback(*self._args)
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2333, in <lambda>
fut.add_done_callback(lambda f: f.result())
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1714, in _execute
if self._prepared_future is not None and not self._prepared_future.done():
AttributeError: 'defaultHandler' object has no attribute '_prepared_future'
Called default handler
ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\http1connection.py", line 273, in _read_message
delegate.finish()
File "C:\Users\******\lib\site-packages\tornado\routing.py", line 268, in finish
self.delegate.finish()
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2297, in finish
self.execute()
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2337, in execute
return self.handler._prepared_future
AttributeError: 'defaultHandler' object has no attribute '_prepared_future'
ERROR:tornado.application:Error in exception logger
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1752, in _handle_request_exception
self.log_exception(*sys.exc_info())
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1790, in log_exception
self._request_summary(),
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1740, in _request_summary
self.request.method,
AttributeError: 'function' object has no attribute 'method'
ERROR:tornado.application:Exception in exception handler
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1708, in _execute
self._handle_request_exception(e)
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1757, in _handle_request_exception
if self._finished:
AttributeError: 'defaultHandler' object has no attribute '_finished'
ERROR:asyncio:Exception in callback _HandlerDelegate.execute.<locals>.<lambda>(<Task finishe...ed_future'",)>) at C:\Users\******\lib\site-packages\tornado\web.py:2333
handle: <Handle _HandlerDelegate.execute.<locals>.<lambda>(<Task finishe...ed_future'",)>) at C:\Users\******\lib\site-packages\tornado\web.py:2333>
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\asyncio\events.py", line 145, in _run
self._callback(*self._args)
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2333, in <lambda>
fut.add_done_callback(lambda f: f.result())
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1714, in _execute
if self._prepared_future is not None and not self._prepared_future.done():
AttributeError: 'defaultHandler' object has no attribute '_prepared_future'
Called default handler
ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\http1connection.py", line 273, in _read_message
delegate.finish()
File "C:\Users\******\lib\site-packages\tornado\routing.py", line 268, in finish
self.delegate.finish()
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2297, in finish
self.execute()
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2337, in execute
return self.handler._prepared_future
AttributeError: 'defaultHandler' object has no attribute '_prepared_future'
ERROR:tornado.application:Error in exception logger
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1752, in _handle_request_exception
self.log_exception(*sys.exc_info())
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1790, in log_exception
self._request_summary(),
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1740, in _request_summary
self.request.method,
AttributeError: 'function' object has no attribute 'method'
ERROR:tornado.application:Exception in exception handler
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1708, in _execute
self._handle_request_exception(e)
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1757, in _handle_request_exception
if self._finished:
AttributeError: 'defaultHandler' object has no attribute '_finished'
ERROR:asyncio:Exception in callback _HandlerDelegate.execute.<locals>.<lambda>(<Task finishe...ed_future'",)>) at C:\Users\******\lib\site-packages\tornado\web.py:2333
handle: <Handle _HandlerDelegate.execute.<locals>.<lambda>(<Task finishe...ed_future'",)>) at C:\Users\******\lib\site-packages\tornado\web.py:2333>
Traceback (most recent call last):
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1665, in _execute
if self.request.method not in self.SUPPORTED_METHODS:
AttributeError: 'function' object has no attribute 'method'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\******\lib\asyncio\events.py", line 145, in _run
self._callback(*self._args)
File "C:\Users\******\lib\site-packages\tornado\web.py", line 2333, in <lambda>
fut.add_done_callback(lambda f: f.result())
File "C:\Users\******\lib\site-packages\tornado\web.py", line 1714, in _execute
if self._prepared_future is not None and not self._prepared_future.done():
AttributeError: 'defaultHandler' object has no attribute '_prepared_future'
What am I doing wrong?我究竟做错了什么? I can't find any example of a working 404 page with python tornado.
我找不到任何使用 python 龙卷风的工作 404 页面的示例。 I looked into routers, but that seemed not to fit here.
我查看了路由器,但这似乎不适合这里。
You should never override __init__
without calling the superclass's __init__
method.如果不调用超类的
__init__
方法,则永远不应覆盖__init__
。 RequestHandler.__init__
takes two arguments which you must pass along. RequestHandler.__init__
需要两个 arguments 您必须传递。 For this reason, it is conventional to override the RequestHandler.initialize
method instead of __init__
.出于这个原因,通常重写
RequestHandler.initialize
方法而不是__init__
。 But it's not clear what arg2 and arg3 are in this example, so I'm not sure why you're overriding this method at all.但是不清楚这个例子中的 arg2 和 arg3 是什么,所以我不确定你为什么要覆盖这个方法。
A conventional 404 handler would look like this:传统的 404 处理程序如下所示:
class DefaultHandler(RequestHandler):
def prepare(self):
# Use prepare() to handle all the HTTP methods
self.set_status(404)
self.finish("404 - my thing")
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