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net: clarify documentation for Dialer.FallbackDelay

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The current documentation describes Fast Fallback as waiting
for IPv6 to succeed before falling back to IPv4. In practice,
the primary address family is determined by the first resolved
address.

Update the documentation to explain that the first resolved
address family is treated as primary and the other family is
used for fallback after FallbackDelay.

Fixes #77967

Change-Id: I77779c9038493fba839cb13662cc4a40f2326bfe
Reviewed-on: https://go-review.googlesource.com/c/go/+/752720
Reviewed-by: Sean Liao <sean@liao.dev>
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Basavaraj PB 2026-03-07 23:43:04 +05:30 • committed by Carlos Amedee
parent 10b5baca54
commit cb39d7aa5c
1 changed files with 7 additions and 4 deletions
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11
src/net/dial.go
View file

@ -160,10 +160,13 @@ type Dialer struct {
DualStack bool
// FallbackDelay specifies the length of time to wait before
// spawning a RFC 6555 Fast Fallback connection. That is, this
// is the amount of time to wait for IPv6 to succeed before
// assuming that IPv6 is misconfigured and falling back to
// IPv4.
// spawning a RFC 6555 Fast Fallback connection.
//
// When dialing "tcp" and both IPv6 and IPv4 addresses are
// available, the address family of the first resolved address
// is treated as the primary. After FallbackDelay, a connection
// attempt to the other address family is started if the primary
// connection has not yet succeeded.
//
// If zero, a default delay of 300ms is used.
// A negative value disables Fast Fallback support.