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site: a GitHub URL with commit.city swapped in lands on the city - #9
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Swapping the domain on a GitHub page is the site's front door, but it only worked on a profile or a repo's front page: /vercel/ai/pulls, /vercel/ai/tree/main and /vercel/next.js/commits/canary were 404s, and /orgs/vercel opened a repo city called "orgs/vercel". - /owner/repo/<anything> and /owner/repo.git redirect to /owner/repo - /orgs/<org>[/...] redirects to /<org> - the dev server applies vercel.json's redirects too, and a test runs the routes through path-to-regexp, which matches them as Vercel does
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facebook/react is react/react now, and commit.city kept two cities of it: /facebook/react served one built 2026-10-11 (685 commits) while /react/react had one a day newer (689). A build was keyed by the name it was asked for, so every old link to a moved repo built a second city. - the page redirects (307) when the city under the asked-for name belongs to a repo that has since moved: /facebook/react -> /react/react - a build of a moved repo is keyed by the current name, checks the current owner's hidden setting, and leaves the old name a meta that redirects, so its later visitors are sent on rather than rebuilding - the page swaps the address bar to the current name when the build starts
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Swapping
github.comforcommit.cityis the site's front door, but it only worked on a profile or a repo's front page. In production today:/vercel/ai/pulls/vercel/ai/vercel/ai/tree/main/packages/ai/vercel/ai/vercel/next.js/commits/canary/vercel/next.js/vercel/ai.git/vercel/ai/orgs/vercel/vercelvercel.jsongets three redirects (307). Existing site paths (/api,/s,/v,/explore, …) are excluded by the same lookahead the rewrites use.scripts/dev.mjsapplies redirects too, in Vercel's order: redirects, then the filesystem, then rewrites.test/routes.test.tsruns a table of paths throughvercel.jsonwith path-to-regexp 6.3.0, which matches the patterns as Vercel does.Tests: web 39, 33 pass, 6 live tests skipped. The dev server returned all five redirects above, and
?x=1query strings are kept.Second commit: a repo GitHub moved has one city, under its current name
facebook/reactisreact/reactnow, and commit.city kept two cities of it./facebook/reactserved one built on 2026-10-11 (685 commits), while/react/reacthad one a day newer (689). Builds were keyed by the name requested, so every old link to a moved repo built a second city./facebook/react→/react/react. A different letter case is still the same name and doesn't redirect.Tests: new
test/page.test.tscovers the redirect; the finish test checks the meta written under the old name. web: 40 tests, 34 pass, 6 live tests skipped.