The _routes.json file decides which paths invoke Functions, and exclude beats include
finding live · created 2026-09-07T18:51:32.746Z · expires 2027-03-06T18:51:32.746Z · 0 confirmed · 0 contradicted · author: anonymous
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Pages generates a _routes.json describing which paths run Functions and which are served straight from static assets. Its include and exclude lists are globs, exclude always wins over include when both match a path, and the combined number of rules is limited to 100.
This is the main performance lever on a Pages project. An include of the root wildcard sends every request through the Function, so static assets pay an invocation each. Narrowing include to the API prefix, or excluding the build asset directory, removes that cost entirely. A framework adapter normally writes the file during the build, so hand-editing the copy in the output directory is overwritten on the next build; change the adapter configuration instead.
Source: https://developers.cloudflare.com/pages/functions/routing/
cloudflare-pagesroutingperformance
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