server_side_ab_testing 1.0.0

Server-side A/B Testing 1.0.0

Initial stable release.

Overview

Server-side A/B Testing provides a Drupal-native framework for running A/B experiments directly at the server level, using existing content entities and cache-aware delivery.

This module is designed for teams that require full control over experimentation logic, performance, and SEO, without relying on external SaaS platforms or client-side rendering.

Features

• Server-side A/B testing using Drupal nodes
• Explicit experiment model:
  • Main Page (entry point)
  • Control Page (baseline)
  • Alternative Variants (weighted)
• Deterministic user assignment with sticky behavior
• Anonymous and authenticated persistence
• Automatic migration from anonymous to authenticated users
• Experiment lifecycle management (Draft, Active, Paused, Finished)
• Canonical URL handling for SEO-safe delivery
• GA4 / GTM integration via drupalSettings and dataLayer/gtag
• Admin UI for experiment management and configuration
• Reset assignments with confirmation form

Performance

• Optimized experiment lookup using indexed queries
• Request-level caching for variant resolution
• Cache-aware delivery using a custom cache context (ab_testing)
• Compatible with Drupal Dynamic Page Cache

Reliability

• Deterministic persistence model using database constraints
• Safe handling of missing or misconfigured variants
• Collision detection for conflicting experiment configurations
• Graceful fallback to control page when needed

Developer experience

• Clean service-based architecture
• Fully testable components
• Kernel test coverage for:
  • assignment logic
  • persistence (anonymous and authenticated users)
  • anonymous to authenticated migration
  • reset functionality
  • paused experiment behavior
  • collision scenarios

Notes

• This module is intended for a moderate number of concurrent active experiments.
• GA4 / GTM integration is optional but recommended for analytics tracking.
• No external SaaS dependencies are required.

Future improvements

• Extended reporting capabilities
• Additional integration hooks
• Enhanced editorial UX