为什么os.Getenv（“ SERVER_SOFTWARE”）为我返回空白字符串？

Question

I recently upgraded to the latest version of the Go SDK (1.8.0), and now when I call os.Getenv("SERVER_SOFTWARE") I get a blank string. I am using this to determine if I am on my local development server or the live environment, and I am not aware of any other way to check. So an answer to either question would suite me just fine: 1) Why is that returning a blank string now? or 2) Is there some other way to check if I'm on the dev server?

Answer 1

So... I've been finding lots of "hey, I'm dumb and there's a better way" answers to my questions lately. This seems to be one of those. So if I back up a step, and address the real question that I'm trying to answer, everything becomes much simpler. I'm just trying to have a way to determine if I'm on the dev server or the live server. I was researching a totally unrelated problem, and found this: appengine.IsDevAppServer(). It's fully documented: https://developers.google.com/appengine/docs/go/reference#IsDevAppServer, I just never saw it until now.