go1.4beta is now ready for testing

Hello Go App Engine users,


Go 1.4 is due to be released very soon. We are now providing a beta
version of the Go 1.4 runtime for those who wish to test their apps
against the new runtime.

While we do not anticipate any issues for existing apps (Go 1.4 is
backward compatible with earlier versions), some implementation
details have changed that may affect the behavior of your app (but not
its correctness). We recommend that you test important apps against
the new runtime using an alternate app version. The tentative release
notes for Go 1.4 are available here:
http://tip.golang.org/doc/go1.4

Note that as we have skipped Go 1.3 on App Engine, its changes will
also be new, so you may wish to review its release notes too:
http://golang.org/doc/go1.3


Go 1.4 has not yet been released, so the go1.4beta runtime is built
from the release-branch.go1.4 of the core Go tree, and may be updated
as Go 1.4 approaches.

We will not be providing a beta version of the Go 1.4 SDK. You should
use goapp deploy (or appcfg.py) from the normal Go App Engine SDK to
deploy your app.

To use go1.4beta, update your app.yaml file to use the new api_version:
api_version: go1.4beta


After Go 1.4 is released it will become the basis for api_version
'go1', as normal, and 'go1.4beta' will be retired soon afterward. We
expect this to happen early next year.

Your feedback and bug reports are most appreciated.


David.

You can use runtime.Version() [1] to see what version your app is
using. It'll most likely only switch when you upload a new version of
your app though.

We expect to announce in this mailing list when we switch go1 to be
based on Go 1.4.


[1] http://golang.org/pkg/runtime/#Version

The docker file is still using 1.2.2 that's why you see the version there. We will have to wait until the Go1.4 support in docker images

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Yours Sincerely
Kun

gplus.to/kunli

With the arrival of the App Engine 1.9.18 release, the standard
api_version go1 is now based on go1.4.2, and api_version go1.4beta is
deprecated. We will stop accepting uploads to it shortly, and stop
serving it entirely not too long after that. If you've got apps using
go1.4beta, now's the time to switch them back to go1.


Thanks.