In-Situ Testing: Tunneling Micro-Frontends into Production Environments
IT InstaTunnel Team Published by our engineering team In-Situ Testing: Tunneling Micro-Frontends into Production Environments Stop guessing how your local component looks in production. Here’s how selective injection techniques let you hot-swap a single production slot with your local dev server — for testing that actually reflects reality. The Staging Environment Is Losing the Battle The traditional staging environment made sense in the monolithic era. You had one codebase, one deployment, and one environment to mirror. That model is crumbling fast. By 2026, most large frontend applications are no longer monoliths. They’re compositions of independently deployed micro-frontends (MFEs), each owned by a separate team, built with potentially different frameworks, and served from different CDN origins. Maintaining a staging environment that faithfully mirrors all of that — including production CDN headers, WAF rules, edge function behaviour, and real user data — has become a Sisyphea...