REST API: GET: /users?username=name&password=password : check if username with password exists response example: [ { "userId": 6, "username": "admin", "password": "5F4DCC3B5AA765D61D8327DEB882CF99" } ] OR { "error": "User with given password not found!" }

POST: /users?username=name&password=password : create username with password if it doesn't exists response example: { "recordsets": [], "output": {}, "rowsAffected": [ 1 ] } OR { "error": "errorString" }

DELETE: /users/userId : delete username with id if it exists response example: { "recordsets": [], "output": {}, "rowsAffected": [ 1 ] } OR { "error": "errorString" }

GET: /users/userID/categories : get user's with userID categories response example: [ { "name": "Sport", "categoryId": 1, "userId": 1 }, { "name": "Fashion", "categoryId": 3, "userId": null } ] OR { "error": "errorString" }

GET: /users/userID/news : get user's with userID news response example: [ { "category": "Sport", "title": "A fan hit David Pastrnak's car in Boston — and he managed to get a picture out of it", "pubDate": "Sat, 2 November 2019 19:20:41 -0400", "link": "https://www.sportingnews.com/us/nhl/news/a-fan-hit-david-pastrnaks-car-in-boston-and-he-managed-to-get-a-picture-out-of-it/106aglfdfrrd01tbxtkhlzntaz" }, { "category": "Sport", "title": "LeBron vs. Luka: James, Lakers win spectacular duel in Dallas", "pubDate": "Sat, 2 November 2019 09:57:09 -0400", "link": "https://www.sportingnews.com/us/nba/news/lebron-vs-luka-james-lakers-win-spectacular-duel-in-dallas/19juuad4mnxjb1kp74k6mkuq0l" } ] OR { "error": "errorString" }

POST: /users/userID/categoryID : link user with userID with category with cartegoryID response example: { "recordsets": [], "output": {}, "rowsAffected": [ 1 ] } OR { "error": "errorString" }

DELETE: /users/userID/categoryID : unlink user with userID with category with cartegoryID response example: { "recordsets": [], "output": {}, "rowsAffected": [ 1 ] } OR { "error": "errorString" }