client-rest | minimalistic TypeScript library to interact | REST library

How to download pdf with name that i set in my code by Restlet Client?

1. RS is one Google plug-in for API Test Tool
2. The question is that I want to download PDF with the name that I set in my code ,but when I click download link in response body ,the PDF's name become to controller's name.
3. If RS can't do that, any other test API tool can do it ?

Summary : I want to pass valid exception output given by one REST service end point to the end user by using my own Rest service.

What I did is, I have called that service in service class using RestTemplate class, it's giving valid output on valid post request. But when I am passing invalid input to it I am getting only '400 BAD REQUEST' result in my service class where I have called that API. But when I am calling that API separately using postman, there I'm getting expected output.

Code sample :

I am working on a Geometry Dash API for Java. I am using WireShark to find out how should some requests look like and then try to do some requests using this, then I write a some java code doing the request and parsing the response. But there's a request, that works inside the restlet client:

So I am getting: