Set X-Robots-Tag: noindex for nonlatest rustdoc #2023
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We want /latest/ URLs to be indexed, but not /1.2.3/ URLs, because the latter compete for pagerank with /latest/ and aren't usually what people want. This replaces the previous canonical URL header. Canonical URLs were doing some good, but did not work in all cases. In particular, if some older version of a crate's documentation was very different than the latest version, Google would not accept the canonicalization. This would sometimes result in the old version still showing up in the search results instead of /latest/.
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We want /latest/ URLs to be indexed, but not /1.2.3/ URLs, because the latter compete for pagerank with /latest/ and aren't usually what people want.
This replaces the previous canonical URL header. Canonical URLs were doing some good, but did not work in all cases. In particular, if some older version of a crate's documentation was very different than the latest version, Google would not accept the canonicalization. This would sometimes result in the old version still showing up in the search results instead of /latest/.
Part of #1438