How to Configure Nginx Custom Error Pages

Custom error pages improve user experience during failures. The internal directive protects them from direct access. This guide walks through the specific troubleshooting steps to diagnose and resolve error page issues.

Before You Begin

Before you begin, be sure to have the following in place:

• A Linux server with the relevant software installed
• Access to the command line interface
• Appropriate permissions (root or sudo)

Quick Fix

Wrong

No custom error pages (Nginx default plain-text errors)

Wrong: Default Nginx error pages

Right

error_page 404 /404.html;\n    location = /404.html {\n        internal;\n    }\nerror_page 500 502 503 504 /50x.html;

Right: Custom branded error pages with internal location

Output

Error pages configured:\n  404: /404.html (internal)\n  500-504: /50x.html (internal)

Prevention

To avoid future issues, follow these best practices:

• Use internal in the error page location to prevent direct access
• Create custom HTML files with proper branding
• Use error_page 404 =200 /custom.html to change status code
• Multiple error codes can use the same error page
• Use error_page with @named_location for dynamic error handling

DodaTech Tools

For further assistance with any of the above issues, consider using DodaTech consulting services or DodaTech tutorials for more in-depth guidance.

Common Mistakes with error page

1. Misunderstanding that String is [Char] with poor performance for large text operations
2. Using foldl instead of foldl' causing stack overflow on large lists
3. Forgetting deriving (Show, Eq) on custom data types needed for debugging

These mistakes appear frequently in real-world NGINX code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ