func fromContext(ctx netcontext.Context) *context {
	c, _ := ctx.Value(&contextKey).(*context)
	return c
}
func fromContext(ctx netcontext.Context) *context {
	c, _ := ctx.Value(&contextKey).(*context)
	return c
}
func fromContext ( ctx netcontext . Context ) * context { c , _ := ctx . Value ( & contextKey ) . ( * context ) return c }
// fromContext returns the App Engine context or nil if ctx is not
// derived from an App Engine context.
fromContext returns the App Engine context or nil if ctx is not derived from an App Engine context .