The package was incorrectly importing both, x/net/context and the new context packages. This change makes autocert use only x/net/context to provide compatibility with the older versions of Go. Change-Id: I520efcaab9cbe919159e4671cee62335a6e107d9 Reviewed-on: https://go-review.googlesource.com/28299 Reviewed-by: Alex Vaghin <ddos@google.com>