Which HTTP response code describes the attempt of accessing restricted resources?

Related questions

1. What is the difference between an API and a Web service?
2. Why do I always see 420 on the clock?
3. What HTTP status code 401 indicates in API?
4. What does HTTP 401 error code stands for?
5. What is a 403 code?
6. What is a 403 Forbidden message?
7. What does authentication failed mean?
8. Why do I get 403 forbidden?
9. Why is API needed?
10. Why do I get forbidden 403?

Tags

1. #users
2. #resource
3. #include
4. #means
5. #authenticated
6. #status
7. #restricted
8. #supposed
9. #certain
10. #failed
11. #according
12. #there
13. #wither
14. #standard
15. #authenticating
16. #response
17. #authentication
18. #unauthorized