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Middleware to make internal requests and forward requests internally.

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      When you call
      ``environ['paste.recursive.include'](new_path_info)`` a response
      will be returned.  The response has a ``body`` attribute, a
      ``status`` attribute, and a ``headers`` attribute.

  paste.recursive.script_name:
      The ``SCRIPT_NAME`` at the point that recursive lives.  Only
      paths underneath this path can be redirected to.

  paste.recursive.old_path_info:
      A list of previous ``PATH_INFO`` values from previous redirects.

Raise ``ForwardRequestException(new_path_info)`` to do a forward
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    A WSGI middleware that allows for recursive and forwarded calls.
    All these calls go to the same 'application', but presumably that
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    Interface is entirely through the ``paste.recursive.forward`` and
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    Used to signal that a request should be forwarded to a different location.

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        The URL to forward to starting with a ``/`` and relative to
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    ``environ``
        An altertative WSGI environment dictionary to use for the forwarded
        request. If specified is used *instead* of the ``url_fragment``

    ``factory``
        If specifed ``factory`` is used instead of ``url`` or ``environ``.
        ``factory`` is a callable that takes a WSGI application object
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        which can alter the forwarded response.

    Basic usage (must have ``RecursiveMiddleware`` present) :

    .. code-block:: python

        from paste.recursive import ForwardRequestException
        def app(environ, start_response):
            if environ['PATH_INFO'] == '/hello':
                start_response("200 OK", [('Content-type', 'text/plain')])
                return ['Hello World!']
            elif environ['PATH_INFO'] == '/error':
                start_response("404 Not Found", [('Content-type', 'text/plain')])
                return ['Page not found']
            else:
                raise ForwardRequestException('/error')

        from paste.recursive import RecursiveMiddleware
        app = RecursiveMiddleware(app)

    If you ran this application and visited ``/hello`` you would get a
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    ``/not_found`` a ``ForwardRequestException`` would be raised and the caught
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    You could also specify an ``environ`` dictionary instead of a url. Using
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    .. code-block:: python

        def app(environ, start_response):
            ... same as previous example ...
            else:
                new_environ = environ.copy()
                new_environ['PATH_INFO'] = '/error'
                raise ForwardRequestException(environ=new_environ)

    Finally, if you want complete control over every aspect of the forward you
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    .. code-block:: python

        from paste.recursive import ForwardRequestException
        from paste.recursive import RecursiveMiddleware
        from paste.errordocument import StatusKeeper

        def app(environ, start_response):
            if environ['PATH_INFO'] == '/hello':
                start_response("200 OK", [('Content-type', 'text/plain')])
                return ['Hello World!']
            elif environ['PATH_INFO'] == '/error':
                start_response("404 Not Found", [('Content-type', 'text/plain')])
                return ['Page not found']
            else:
                def factory(app):
                    return StatusKeeper(app, status='404 Not Found', url='/error')
                raise ForwardRequestException(factory=factory)

        app = RecursiveMiddleware(app)
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