What is the significance of response codes in the system and how are they interpreted?

Status codes (e.g., HTTP statuses) serve to inform the client about the result of a request. They usually consist of three digits and are divided into categories:

• 1xx — informational: request received, processing continues.
• 2xx — success: request was successfully processed (e.g., 200 OK).
• 3xx — redirection: further action is needed (e.g., 301 Moved Permanently).
• 4xx — client error: request contains an error (e.g., 404 Not Found).
• 5xx — server error: server failed to fulfill the request (e.g., 500 Internal Server Error).

Interpreting the code helps determine further actions: retry the request, correct data, follow a new URL, etc.