render_exception(env, exception) private

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# File actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 71
    def render_exception(env, exception)
      wrapper = ExceptionWrapper.new(env, exception)
      status  = wrapper.status_code
      env["action_dispatch.exception"] = wrapper.exception
      env["PATH_INFO"] = "/#{status}"
      response = @exceptions_app.call(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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