Mercari Migrates Legacy Image Pipeline to Cloudflare Images with Zero‑Downtime Dual‑Path Rollout
Mercari's Platform Network team moved a long‑standing image resizing service to Cloudflare Images while keeping all existing URLs alive by running legacy and new paths in parallel and using Cloudflare edge origin overrides with S3 host‑header HTTPS. The post details traffic estimation, safe rollout tactics, and cost trade‑offs for a seamless migration.