django_landing_simple.error_simple.views

This module provides centralized error handling for simple web applications, implementing custom error pages for HTTP status codes and test triggers for development/testing environments. It ensures users receive informative, branded error messages when issues occur.

Business Context:

Professional error handling is crucial for user experience and application credibility. When users encounter errors (page not found, server errors, permission issues), they receive user-friendly error pages that maintain the application’s brand experience and provide helpful guidance. This module ensures consistent error handling across the entire application.

Key Business Value:

1. User Experience:

• Professional, branded error pages instead of generic browser errors

  • Clear messaging about what went wrong

  • Guidance on how to proceed (return home, contact support)

  • Consistent design with application theme

  • Multi-language support for error messages

2. Development & Testing:

• Test trigger views for QA and development

  • Easy error page validation before production

  • Consistent error handling patterns

  • Quick verification of error page appearance

3. Production Reliability:

• Graceful error handling prevents application crashes

  • User-friendly messages maintain application trust

  • Clear error identification for troubleshooting

  • Professional appearance during failures

Error Handling:

Production Error Handlers (Called by Django automatically):

• error_400_view(): Bad Request - Malformed client request

• error_403_view(): Forbidden - Permission denied

• error_404_view(): Not Found - Resource doesn’t exist

• error_500_view(): Internal Server Error - Application error

• error_502_view(): Bad Gateway - Proxy/upstream server error

• error_503_view(): Service Unavailable - Temporary maintenance/overload

Test Trigger Views (For development/testing only):

• trigger_400_test(): Generate test 400 error

• trigger_403_test(): Generate test 403 error

• trigger_404_test(): Generate test 404 error

• trigger_500_test(): Generate test 500 error

• trigger_502_test(): Generate test 502 error

• trigger_503_test(): Generate test 503 error

Common Error Scenarios:

• 400 Bad Request: User submits malformed data or suspicious operation

• 403 Forbidden: User attempts unauthorized action

• 404 Not Found: User navigates to non-existent page or resource

• 500 Internal Server Error: Application logic error or backend failure

• 502 Bad Gateway: Backend server connection issues

• 503 Service Unavailable: Application maintenance or overload

Technical Features:

• Custom error templates with application branding

• HTTP status code preservation

• Exception handling with Django’s exception framework

• Test routes for error page validation

• Integration with Django’s error handling middleware

• Multi-language support via Django i18n

Integration:

Error views integrate with: - Django’s URL routing for error handlers - Template system for consistent branding - Internationalization framework for multi-language errors - Django settings for error handler configuration

Security:

• No sensitive information exposed in error messages

• Test trigger views should be disabled in production

• Safe exception handling prevents information disclosure

• Generic error messages for security

Production Configuration:

In settings.urls, configure error handlers:

• handler400 = error_400_view()

• handler403 = error_403_view()

• handler404 = error_404_view()

• handler500 = error_500_view()

Important: Test trigger views must be removed from production URL configuration.

Testing Error Pages:

During development, access test triggers via URL patterns: - /error/400/ - Test Bad Request page - /error/403/ - Test Forbidden page - /error/404/ - Test Not Found page - /error/500/ - Test Internal Server Error page - /error/502/ - Test Bad Gateway page - /error/503/ - Test Service Unavailable page

Best Practices:

• Always test error pages before production deployment

• Ensure error pages match application branding

• Provide clear, helpful guidance to users

• Never expose technical details in error messages

• Remove test trigger URLs from production

• Use appropriate HTTP status codes

• Keep error messages user-friendly and non-technical

Functions

error_400_view(request, exception)	Error handling for 400 error.
error_403_view(request, exception)	Error handling for 403 error.
error_404_view(request, exception)	Error handling for 404 error.
error_500_view(request, *args, **argv)	Error handling for 500 error.
error_502_view(request, *args, **argv)	Error handling for 502 Bad Gateway error.
error_503_view(request, *args, **argv)	Error handling for 503 Service Unavailable error.
trigger_400_test(request)	Test view to trigger a 400 Bad Request error.
trigger_403_test(request)	Test view to trigger a 403 Forbidden error.
trigger_404_test(request)	Test view to trigger a 404 Not Found error.
trigger_500_test(request)	Test view to trigger a 500 Internal Server Error.
trigger_502_test(request)	Test view to manually trigger a 502 Bad Gateway error.
trigger_503_test(request)	Test view to manually trigger a 503 Service Unavailable error.

django_landing_simple.error_simple.views.error_400_view(request, exception)

Error handling for 400 error.

django_landing_simple.error_simple.views.error_403_view(request, exception)

Error handling for 403 error.

django_landing_simple.error_simple.views.error_404_view(request, exception)

Error handling for 404 error.

django_landing_simple.error_simple.views.error_500_view(request, *args, **argv)

Error handling for 500 error.

django_landing_simple.error_simple.views.error_502_view(request, *args, **argv)

Error handling for 502 Bad Gateway error.

django_landing_simple.error_simple.views.error_503_view(request, *args, **argv)

Error handling for 503 Service Unavailable error.

django_landing_simple.error_simple.views.trigger_400_test(request)

Test view to trigger a 400 Bad Request error. This view should only be used in testing environments.

django_landing_simple.error_simple.views.trigger_403_test(request)

Test view to trigger a 403 Forbidden error. This view should only be used in testing environments.

django_landing_simple.error_simple.views.trigger_404_test(request)

Test view to trigger a 404 Not Found error. This view should only be used in testing environments.

django_landing_simple.error_simple.views.trigger_500_test(request)

Test view to trigger a 500 Internal Server Error. This view should only be used in testing environments.

django_landing_simple.error_simple.views.trigger_502_test(request)

Test view to manually trigger a 502 Bad Gateway error. This view should only be used in testing environments. Note: Real 502 errors occur at the web server level, not in Django.

django_landing_simple.error_simple.views.trigger_503_test(request)

Test view to manually trigger a 503 Service Unavailable error. This view should only be used in testing environments. Note: Real 503 errors typically occur at the web server level for maintenance mode.