How to control the HTTP response code from a Restlets resource?

Question

I am currently working with the Restlets framework, and I cannot find a way to manually set the HTTP response code within a service method. Consider the following snippet of code:

public class MyResource extends ServerResource {
    @Post("json")
    public Representation doSomething(Representation entity) throws IOException {
        int status = 200;
        try {
            // do something which might throw an exception
        }
        catch (Exception e) {
            // log the exception
            // *** I would like to assign HTTP status 500 here ***
            status = 500;
        }

        JSONObject responseJSON = new JSONObject();
        responseJSON.put("result", "some data");
        Representation rep = new JsonRepresentation(responseJSON.toJSONString());

        return rep;
    }
}

I have the ability to catch and log an exception, should one occur, but it is not clear how I can change the HTTP response code. As far as I know, returning from doSomething will automatically be handled by Restlets with an 200 HTTP response code.

I know how to assign the status code directly from a filter or servlet, but is it possible to do this within Restlets, without going down the servlet layer?

jasper · Answer 1 · 2017-12-29T06:33:54.607

As far as I know, there is an object called ResponseEntity which you can use to operate with microservices and a request-response programming model, which allows you to specify the returning HTTP return code. However, you need entities for this, and I think this goes below your abstraction level of Servlets.

You can change them to some predefined values such as HTTP.INTERNAL_SERVER_ERROR and such, which translate to a value in the end, which you can Google in the end.

I hope this was of some help

EDIT:

Import the necessary resource for a ResponseEntity object. In STS, it is

import org.springframework.http.ReponseEntity;
import org.springframework.http.HttpStatus;

public class MyResource extends ServerResource {
@Post("json")
public ResponseEntity<Representation> doSomething(Representation entity) throws IOException {
    int status = 200;
    try {
        // do something which might throw an exception
    }
    catch (Exception e) {
        ResponseEntity<Representation> response = null;
        response = new ResponseEntity<Representation>(HttpStatus.INTERNAL_SERVER_ERROR);
        return response;
    }

    JSONObject responseJSON = new JSONObject();
    responseJSON.put("result", "some data");
    Representation rep = new JsonRepresentation(responseJSON.toJSONString());

    return rep;
}

And sorry for the delay. I am new to Stack Overflow

Can you take my code snippet above and answer in terms of that? You basically said "yes, we can return HTTP codes," but you didn't show us _how_ to do this. — Tim Biegeleisen, Dec 29 '17 at 06:15
Let me turn on my computer and provide you an example of some work I have done. 30 minutes and you will have it — jasper, Dec 29 '17 at 06:17

How to control the HTTP response code from a Restlets resource?

1 Answers1