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Add noindex header to versioned docs subdomains - #2087
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Old docs versions on X.Y.sourcegraph.com are indexed by Google. Send X-Robots-Tag: noindex on those hosts. sourcegraph.com/docs is not affected.
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Matches the noindex, nofollow meta tag on 5.2–6.1.
BolajiOlajide
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Google indexes old docs versions, such as
6.5.sourcegraph.com/deep-search(reported in Slack). These pages outranksourcegraph.com/docsfor "deep search". They have a canonical link tosourcegraph.com/docs, but Google treats a canonical as a hint, not a rule.This PR sends
X-Robots-Tag: noindex, nofollowon hosts like6.5.sourcegraph.com. It does not affectsourcegraph.com/docs.Why it happened
Each version branch in
sourcegraph/docs-legacy-versionsis a copy ofmain.mainhas no noindex rule for versioned subdomains. So each version only has what was added to it by hand, or whatmainhad when the branch was cut:noindex, nofollowmeta tag, added to these branches onlyDisallow: /from #1480Allow: /since #1718, no noindexPlan
mainlater get the header.v6_2–v7_7insourcegraph/docs-legacy-versions. Onv6_11,v6_12andv7_0, also change robots.txt toAllow: /, so Google can see the header.X-Robots-Tag: noindex, nofollow.Test plan
6.5.sourcegraph.comand6.12.sourcegraph.com. It does not matchsourcegraph.com,www.sourcegraph.com, or*.vercel.app(checked in Node).sourcegraph.com/docshas noX-Robots-Tagheader.