update Go, fix, add /@latest to goproxytest#302
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rogpeppe
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Apr 15, 2026
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Mostly LGTM but I think the version selection criteria aren't quite right.
Mainly so that gopls is not as noisy when editing files.
rogpeppe
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Apr 15, 2026
The Go module proxy protocol defines a $base/$module/@latest endpoint that returns the .info JSON for the latest version of a module. The handler only matched paths containing /@v/, so /@latest got a 404. Add a check for the /@latest suffix before the /@v/ routing. When matched, find the highest release version, falling back to pre-release versions if no release exists, and serve its .info file. The version selection is in a standalone latestVersion function that takes an iter.Seq[string], following the same algorithm as cue-lang/cue's LatestVersion in internal/mod/modload/query.go. The test is a direct HTTP unit test rather than a testscript like testdata/list.txt because the go command does not expose /@latest responses to the user; it uses the endpoint internally as a fallback. There is no go subcommand whose output we could assert on in a script to verify that /@latest is served correctly.
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(see commit messages - please do not squash)