Not getting correct error message for Scripted REST API

[Mahesh Bachhav]

I have scripted REST API that accepts request body in JSON format and the maximum size is 10 MB(default).

Partial REST API Code - 

(function process(/*RESTAPIRequest*/ request, /*RESTAPIResponse*/ response) {
    var requestBody = request.body;
    var requestString = requestBody.dataString;
    
    .
    .
    .
    .
    .
    .
})(request, response);

If the size of request body is more than 10 MB then ServiceNow returns 500 Internal Server Error response with the below error message - 

I am expecting the below error message from the API response. How to get the below error message?

[Marc Mouries]

To handle a response data larger than 10 MB you need to use a Data Stream

https://docs.servicenow.com/bundle/rome-servicenow-platform/page/administer/integrationhub/tasks/use-data-stream-in-flow.html

[Tony Chatfield1]

Hi, I have not found any SNC reference to configuring custom response for excessive payload size, can you clarify where this is configured?
I am guessing but if it is in the scripted REST API and if your file size exceeds the set limits, then I would not expect the payload to get as far as your scripted REST API so could not generate the custom message.

[Hitoshi Ozawa]

Hi Mahesh,

Is there a try-catch block to catch errors in code?

getMessage() is a function to get message translation. An error may be occurring somewhere in the code and not being able to get a message to be returned.