What is the difference between this two AppEngine packages: https://cloud.google.com/appengine/docs/go/reference https://godoc.org/google.golang.org/appengine
The only thing that stands out for me is that 2nd one has no Context type
Which one should someone use in developing an application?
The "google.golang.org/appengine" packages work on both managed VMs and App Engine Classic. The "appengine" packages work on App Engine Classic only.
The "google.golang.org/appengine" packages use the x/net/context package for passing context around. The "appengine" packages use a context specific to those packages.
See https://github.com/golang/appengine#3-update-code-using-deprecated-removed-or-modified-apis for a list of differences in the APIs.