Is your Node.js or Express app showing 127.0.0.1 for every visitor behind an Apache reverse proxy? This guide explains the Localhost IP masking problem, why Apache hides real client IP addresses, and how it impacts rate limiting, security logging, analytics, and compliance. Learn the correct Apache VirtualHost and Express trust proxy configuration to restore real user IP visibility and secure your production environment. Discover a Zero-Error architecture approach used in high-security, global-scale deployments.

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