How to know if timeout occurred in cypher query?

I'm using apoc.cypher.runTimeboxed https://neo4j.com/labs/apoc/4.1/cypher-execution/cypher-timeboxed/

I'm using the HTTP API of neo4j. I'm making HTTP post requests like below.

HTTP request on developer tools of my browser

Here I do NOT see any difference if the results are really empty or if the results are empty because TIMEOUT OCCURRED. I think there should be a warning or error message.