HTTP Status Hub

Troubleshooting Guides

Step-by-step guides to diagnose and fix the most common HTTP errors. Follow these systematic approaches to quickly resolve issues.

404

Fixing 404 Not Found Errors

  1. 1Verify the URL is spelled correctly
  2. 2Check if the file/resource exists on the server
  3. 3Review server access logs for the request
  4. 4Check for recent deployments that may have moved files
  5. 5Set up proper redirects for changed URLs
  6. 6Implement a custom 404 page for better UX
View full 404 documentationGet fix code
500

Debugging 500 Internal Server Errors

  1. 1Check application error logs immediately
  2. 2Review recent code changes or deployments
  3. 3Verify database connections are working
  4. 4Check for memory or resource exhaustion
  5. 5Test in development environment to reproduce
  6. 6Add proper error handling to identify the issue
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502

Resolving 502 Bad Gateway Errors

  1. 1Verify upstream/backend server is running
  2. 2Check proxy configuration (nginx, apache)
  3. 3Review upstream server logs
  4. 4Verify network connectivity between servers
  5. 5Increase proxy timeout values
  6. 6Check firewall rules blocking connections
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503

Handling 503 Service Unavailable

  1. 1Check if server is in maintenance mode
  2. 2Monitor server resource usage (CPU, memory)
  3. 3Review rate limiting configuration
  4. 4Scale up server resources if overloaded
  5. 5Check for deployment issues
  6. 6Implement proper health checks
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401

Fixing 401 Unauthorized Errors

  1. 1Verify authentication credentials are correct
  2. 2Check if token has expired
  3. 3Ensure Authorization header is properly formatted
  4. 4Verify API keys are valid and active
  5. 5Check for clock skew issues with time-based tokens
  6. 6Review authentication service logs
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403

Resolving 403 Forbidden Errors

  1. 1Verify user has required permissions
  2. 2Check file/directory permissions on server
  3. 3Review IP whitelist/blacklist rules
  4. 4Verify CORS configuration for API requests
  5. 5Check for directory listing restrictions
  6. 6Review role-based access control settings
View full 403 documentationGet fix code

Pro Tips for Debugging HTTP Errors

  • Always check server logs first - they contain the most detailed error information
  • Use browser developer tools to inspect network requests and response headers
  • Test with curl to isolate browser-specific issues
  • Check for recent changes - most errors occur after deployments
  • Set up monitoring and alerts to catch errors early