Question 1

What are HTTP status codes?

Accepted Answer

HTTP status codes are 3-digit numbers returned by a server in response to a client request. They indicate whether the request succeeded, failed, or requires further action. They are grouped into 5 classes: 1xx informational, 2xx success, 3xx redirection, 4xx client error, 5xx server error.

Question 2

What is the difference between 401 and 403?

Accepted Answer

401 Unauthorized means the request lacks valid authentication credentials. 403 Forbidden means the server understood the request and the client is authenticated, but access is still denied.

Question 3

What does 301 vs 302 mean?

Accepted Answer

301 Moved Permanently indicates the resource has permanently moved to a new URL and search engines should update their index. 302 Found indicates a temporary redirect; the original URL should continue to be used.

Question 4

What is a 418 status code?

Accepted Answer

418 I'm a teapot is a humorous status code defined in RFC 2324 (HTCPCP). It indicates the server refuses to brew coffee because it is, permanently, a teapot. Some APIs use it for Easter eggs or for rejected requests.

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