render_exception(request, exception) private

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# File actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 44
      def render_exception(request, exception)
        backtrace_cleaner = request.get_header "action_dispatch.backtrace_cleaner"
        wrapper = ExceptionWrapper.new(backtrace_cleaner, exception)
        status  = wrapper.status_code
        request.set_header "action_dispatch.exception", wrapper.unwrapped_exception
        request.set_header "action_dispatch.original_path", request.path_info
        request.path_info = "/#{status}"
        response = @exceptions_app.call(request.env)
        response[1]["X-Cascade"] == "pass" ? pass_response(status) : response
      rescue Exception => failsafe_error
        $stderr.puts "Error during failsafe response: #{failsafe_error}\n  #{failsafe_error.backtrace * "\n  "}"
        FAILSAFE_RESPONSE
      end
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