HttpRequest req = new HttpRequest();
req.setHeader('Authorization', 'Bearer ' + UserInfo.getSessionID());
req.setHeader('Content-Type', 'application/json');
req.setEndpoint('https://na11.salesforce.com/services/data/v32.0/tooling/sobjects/Profile/00eA0000000WrUv');
req.setMethod('GET');
Http h = new Http();
HttpResponse res = h.send(req);
system.debug(res.getBody());