What does HTTP status code 500 Internal Server Error indicate?

• A. Client made a bad request
• B. Server encountered an unexpected condition preventing fulfillment
• C. Resource has moved
• D. Proxy error

Answer: (B)

500 Internal Server Error signals a problem on the server side: something went wrong while processing the request, and the server couldn’t fulfill it due to an unexpected condition. This is a generic indication of a server-side failure, often caused by uncaught exceptions, misconfigurations, or issues with dependencies. The server doesn’t reveal specifics to the client for security, so logs are used to diagnose.

In contrast, a bad request from the client would return a 400 status, indicating malformed syntax or invalid data sent by the client. If a resource has moved, a 3xx redirect is returned, guiding the client to the new location. A proxy error would involve codes like 502 or 504, signaling problems in a gateway or proxy between client and server.