x/pkgsite: golang.org redirects /pkg/foo/ to another redirect

[bradfitz]

The golang.org /pkg/ redirect pages redirect to another redirect:

bradfitz@book1pro ~ % curl -I https://golang.org/pkg/crypto/tls/
HTTP/2 301 
content-type: text/html; charset=utf-8
location: https://go.dev/pkg/crypto/tls/
date: Wed, 27 Jul 2022 02:23:28 GMT
server: Google Frontend

But that location (https://go.dev/pkg/crypto/tls/) serves another redirect:

bradfitz@book1pro ~ % curl -I https://go.dev/pkg/crypto/tls/
HTTP/2 307 
content-type: text/html; charset=utf-8
location: https://pkg.go.dev/crypto/tls
date: Wed, 27 Jul 2022 02:24:40 GMT
server: Google Frontend

Just have golang.org redirect to the version without the trailing slash instead?

[gopherbot]

Change https://go.dev/cl/419634 mentions this issue: doc/go1.19: fix a few links that were missing trailing slashes

[hyangah]

The relevant redirect logic (reported by @prattmic)

https://cs.opensource.google/go/x/website/+/master:cmd/golangorg/server.go;l=174
https://cs.opensource.google/go/x/website/+/master:internal/pkgdoc/doc.go;l=523
https://cs.opensource.google/go/x/website/+/master:internal/pkgdoc/doc.go;l=453