Question 1

What are HTTP status codes?

Accepted Answer

HTTP status codes are three-digit numbers returned by a server in response to a client request. They indicate whether the request was successful, redirected, encountered a client error, or a server error.

Question 2

What is the difference between 4xx and 5xx errors?

Accepted Answer

4xx errors indicate client-side problems — the request was malformed, unauthorized, or requested a resource that doesn't exist. 5xx errors indicate server-side problems — the server failed to fulfil a valid request.

Question 3

What does HTTP 200 OK mean?

Accepted Answer

HTTP 200 OK means the request succeeded. The response body contains the requested resource or the result of the action.

Question 4

What is a 301 redirect?

Accepted Answer

HTTP 301 Moved Permanently indicates the requested URL has been permanently moved to a new location. Browsers and search engines update their links to the new URL.

Question 5

What causes a 429 Too Many Requests error?

Accepted Answer

HTTP 429 Too Many Requests means the client has sent too many requests in a given time window. The server is rate-limiting the client. The Retry-After header often indicates when to try again.

HTTP Status Codes

1xx Informational

2xx Success

3xx Redirection

4xx Client Error

5xx Server Error