How can I intercept this response - {"message": "An invalid response was received from the upstream server"}?

[Sereneee]

I have postman, Kong and a microservice setup locally. In kong, I have a route that points to the local microservice, when it is running, I can send request through postman and receive a response perfectly fine.
When the microservice is down, I get {"message": "An invalid response was received from the upstream server"} response, which I believe is triggered because Kong detected a connection timeout (please correct me if I'm wrong).
Does anyone know how I can detect the connection timeout using a custom kong plugin or anything else?

[locao]

Hi @Sereneee! You should receive a 504 status code and the "message" field should contain "The upstream server is timing out" when the upstream is timing out.

What do you get if you send the request directly to the microservice port when it is down?

[Sereneee]

Hi @locao , thanks for your response.

I'm getting 502 status code and the "message" field containing "An invalid response was received from the upstream server" when I send request directly to the microservice when it is down.

Is there anyway that Kong can detect a connection timeout other than receiving 502 or 504 status code and their respective messages?

[kikito]

This looks like a duplicate of #7242, please don't open multiple threads for the same question.