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Cascades through several applications, so long as applications
return ``404 Not Found``.
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Entry point for Paste Deploy configuration
Expects configuration like::
[composit:cascade]
use = egg:Paste#cascade
# all start with 'app' and are sorted alphabetically
app1 = foo
app2 = bar
...
catch = 404 500 ...
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Passed a list of applications, ``Cascade`` will try each of them
in turn. If one returns a status code listed in ``catch`` (by
default just ``404 Not Found``) then the next application is
tried.
If all applications fail, then the last application's failure
response is used.
Instances of this class are WSGI applications.
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