Documentation Index
Fetch the complete documentation index at: https://developer.upsun.com/llms.txt
Use this file to discover all available pages before exploring further.
Blog
Technical articles, deep dives, and announcements from the Upsun team and community.
Recent
InsightsMay 12, 2026
Rate limiting Rails apps when you can’t put Varnish in front
When the edge isn’t yours, rate limit from inside the application. How rack-attack works, why limits are about quality of service, and what Rails 8 changed.
InsightsMay 5, 2026
The (not so) hidden cost of AI scrapers
AI scrapers drive up your hosting cost while real users wait. Use robots.txt, cache normalization, and sane application limits to take the pressure off.
How-TosApr 30, 2026
Supply chain attacks in the AI era, and what to do about them
AI agents are reading code at scale, including your dependencies. Why supply chain risk just changed, plus a build-time fix to add on Upsun.