Swagger using api, requests give: "...No 'Access-Control-Allow-Origin'...Origin 'null' is therefore not allowed access" what to do?

Question

CORS

The employer gave a test task: write the client part for Api and gave a link to swagger.
the point is:
I am writing a request to the address

$http({method:'POST', url:'http://frontendtest.xrm.ru/api/Sessions'})
            .success(function(result){
                return result;
            })
            .error(function(err){
                console.log('session not get',err);
            })

and get a response with code 200

XMLHttpRequest cannot load http://frontendtest.xrm.ru/api/Sessions. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

Googled that the problem is in cross-domain requests in browsers. while I see the proposed solution in doing communication through my server, I would not want to spend time on this, and I think there are still easier ways.
and time is running out, help..

Answer 1

Simpler ways:
On the server ( frontendtest.xrm.ru which) implement CORS