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net/http: Server.ServeTLS docs are wrong about H/2 #24607

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FiloSottile opened this issue Mar 30, 2018 · 2 comments
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net/http: Server.ServeTLS docs are wrong about H/2 #24607

FiloSottile opened this issue Mar 30, 2018 · 2 comments
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Documentation FrozenDueToAge NeedsFix
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Go1.11

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@FiloSottile FiloSottile commented Mar 30, 2018

For HTTP/2 support, srv.TLSConfig should be initialized to the provided listener's TLS Config before calling ServeTLS. If srv.TLSConfig is non-nil and doesn't include the string "h2" in Config.NextProtos, HTTP/2 support is not enabled.

Since ServeTLS gets to create the tls.Listener, it can initialize the TLSConfig fully, and it does. So the second paragraph is wrong. (Probably because it was copied from Serve #23028.)

Also, ListenAndServeTLS doesn't mention H/2 at all, but applies the same rules as ServeTLS.

The rules are pretty messy, probably worth reviewing all [Server.][ListenAnd]Serve[TLS] docs.

See also #22018
@FiloSottile FiloSottile added this to the Go1.11 milestone Mar 30, 2018
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@gopherbot gopherbot commented Mar 30, 2018

Change https://golang.org/cl/103815 mentions this issue: net/http: fix and normalize the [Server.][ListenAnd]Serve[TLS] docs
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@gopherbot gopherbot commented Jul 23, 2018

Change https://golang.org/cl/125515 mentions this issue: net/http: update Serve docs on when HTTP/2 is enabled
@gopherbot gopherbot closed this in 214f7ec Jul 23, 2018
gopherbot pushed a commit that referenced this issue Jul 24, 2018
@FiloSottile
net/http: fix and normalize the [Server.][ListenAnd]Serve[TLS] docs
7bebc6b 
The only inaccurate part was the HTTP/2 caveat in Server.ServeTLS, which
only applies to the plain Serve variant.

The restriction implemented in shouldConfigureHTTP2ForServe is not on
the setupHTTP2_ServeTLS codepath because ServeTLS owns the tls.Listener,
so we fix it for the user instead of disabling HTTP/2.

Fixes #24607

Change-Id: Ie5f207d0201f09db27bf81b75535e5f6fdaf91e2
Reviewed-on: https://go-review.googlesource.com/103815
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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