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When adding MPTCP support to address the proposal #56539, I missed the GODEBUG setting from Russ Cox's plan: I am inclined to say that we add MPTCP as an opt-in for a release or two, and then make it opt-out. There should be a GODEBUG setting (...) See: https://github.com/golang/go/issues/56539#issuecomment-1309294637 Thanks to andrius4669 for having reported this issue to me. It makes sense to have this GODEBUG setting not to have to modify applications to use MPTCP (if available). It can then be useful to estimate the impact in case we want to switch from opt-in to opt-out later. The MPTCP E2E test has been modified to make sure we can enable MPTCP either via the source code like it was already the case before or with this environment variable: GODEBUG=multipathtcp=1 The documentation has been adapted accordingly. I don't know if it is too late for Go 1.21 but I had to put a version in the documentation. The modification is small, the risk seems low and this was supposed to be there from the beginning according to Russ Cox's specifications. It can also be backported or only be present in the future v1.22 if it is easier. Note: I didn't re-open #56539 or open a new one. It is not clear to me what I should do in this case. Fixes #56539 Change-Id: I9201f4dc0b99e3643075a34c7032a95528c48fa0 Reviewed-on: https://go-review.googlesource.com/c/go/+/507375 Reviewed-by: Cherry Mui <cherryyz@google.com> Auto-Submit: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Damien Neil <dneil@google.com> |
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