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Middleware to display error documents for certain status codes
The middleware in this module can be used to intercept responses with
specified status codes and internally forward the request to an appropriate
URL where the content can be displayed to the user as an error document.
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Intercepts a response with a particular status code and returns the
content from a specified URL instead.
The arguments are:
``app``
The WSGI application or middleware chain.
``codes``
A dictionary of integer status codes and the URL to be displayed
if the response uses that code.
For example, you might want to create a static file to display a
"File Not Found" message at the URL ``/error404.html`` and then use
``forward`` middleware to catch all 404 status codes and display the page
you created. In this example ``app`` is your exisiting WSGI
applicaiton::
from paste.errordocument import forward
app = forward(app, codes={404:'/error404.html'})
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Middleware that lets you test a response against a custom mapper object to
programatically determine whether to internally forward to another URL and
if so, which URL to forward to.
If you don't need the full power of this middleware you might choose to use
the simpler ``forward`` middleware instead.
The arguments are:
``app``
The WSGI application or middleware chain.
``mapper``
A callable that takes a status code as the
first parameter, a message as the second, and accepts optional environ,
global_conf and named argments afterwards. It should return a
URL to forward to or ``None`` if the code is not to be intercepted.
``global_conf``
Optional default configuration from your config file. If ``debug`` is
set to ``true`` a message will be written to ``wsgi.errors`` on each
internal forward stating the URL forwarded to.
``**params``
Optional, any other configuration and extra arguments you wish to
pass which will in turn be passed back to the custom mapper object.
Here is an example where a ``404 File Not Found`` status response would be
redirected to the URL ``/error?code=404&message=File%20Not%20Found``. This
could be useful for passing the status code and message into another
application to display an error document:
.. code-block:: python
from paste.errordocument import StatusBasedForward
from paste.recursive import RecursiveMiddleware
from urllib import urlencode
def error_mapper(code, message, environ, global_conf, kw)
if code in [404, 500]:
params = urlencode({'message':message, 'code':code})
url = '/error?'%(params)
return url
else:
return None
app = RecursiveMiddleware(
StatusBasedForward(app, mapper=error_mapper),
)
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Paste Deploy entry point to create a error document wrapper.
Use like::
[filter-app:main]
use = egg:Paste#errordocument
next = real-app
500 = /lib/msg/500.html
404 = /lib/msg/404.html
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Deprectated; use StatusBasedForward instead.
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Deprectated; use StatusBasedForward instead.
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<html>
<head>
<title>Error %(code)s</title>
</html>
<body>
<h1>Error %(code)s</h1>
<p>%(message)s</p>
<hr>
<p>
Additionally an error occurred trying to produce an
error document. A description of the error was logged
to <tt>wsgi.errors</tt>.
</p>
</body>
</html>
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We don't want start_response to do anything since it
has already been called
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