# Appendix A: HTTP Status Codes Reference

# HTTP Status Codes

## Success Codes
- **200 OK**: Request succeeded
- **201 Created**: Resource created

## Client Errors
- **400 Bad Request**: Invalid request
- **401 Unauthorized**: Missing or invalid API key
- **403 Forbidden**: Access denied
- **404 Not Found**: Resource not found
- **429 Too Many Requests**: Rate limit exceeded

## Server Errors
- **500 Internal Server Error**: Server error
- **502 Bad Gateway**: Gateway error
- **503 Service Unavailable**: Service unavailable