How To Target Your Users with Nginx Analytics and A/B Testing

A practical guide to using Nginx's built-in modules for A/B testing and user analytics without external tools. Covers the `split_clients` module for splitting traffic by IP hash into percentage-based groups to serve different content, the `empty_gif` module for implementing tracking pixels with custom log formats, and the `ngx_http_geoip_module` for geo-targeting users by country or city using MaxMind databases. Includes working configuration examples for each feature.