Error Reference

4xx Errors

Client-side errors requiring input validation

5xx Errors

Server-side errors requiring system recovery

Custom Errors

Example.com specific error handling

Common HTTP Errors

404
Page Not Found

The requested resource could not be found

HTTP/1.1 404 Not Found
Location: /error/404
Content-Type: application/json

{
  "error": "Resource not found",
  "request_id": "1234567890"
}
500
Server Error

Internal server encountered an unexpected condition

HTTP/1.1 50,InternalServerError
Content-Type: application/json

{
  "error": "System unavailable",
  "retry_after": "15s",
  "request_id": "0987654321"
}

Simulate an API Error

This will simulate error responses for learning purposes without impacting production systems.

Debugging Checklist

  1. Verify request headers and authentication tokens
  2. Check server logs for stack traces
  3. Simulate requests with curl or Postman
  4. Test fallback paths and error recovery