related status codes are returned from the application.

    This behavior can be altered by changing the parameters to the

    ErrorDocuments middleware in your config/middleware.py file.

    """

    def __before__(self):

        # disable all base actions since we don't need them here

        pass

    def document(self):

        resp = request.environ.get('pylons.original_response')

        c.site_name = config.get('title')

        log.debug('### %s ###' % (resp and resp.status or 'no response'))

        e = request.environ

        c.serv_p = r'%(protocol)s://%(host)s/' % {

            'protocol': e.get('wsgi.url_scheme'),

            'host': e.get('HTTP_HOST'), }

        if resp:

            c.error_message = cgi.escape(request.GET.get('code',

                                                         str(resp.status)))

            c.error_explanation = self.get_error_explanation(resp.status_int)

        return render('/errors/error_document.html')

    def img(self, id):

        """Serve Pylons' stock images"""

        return self._serve_file(os.path.join(media_path, 'img', id))

    def style(self, id):

        """Serve Pylons' stock stylesheets"""

        return self._serve_file(os.path.join(media_path, 'style', id))

    def _serve_file(self, path):

        """Call Paste's FileApp (a WSGI application) to serve the file

        at the specified path

        """

        fapp = paste.fileapp.FileApp(path)

        return fapp(request.environ, self.start_response)

    def get_error_explanation(self, code):

        """ get the error explanations of int codes

            [400, 401, 403, 404, 500]"""

        try:

            code = int(code)

        except ValueError: