So, the point of this is if you don't have either curl or python, but you do have golang. I can't imagine when that would happen. Is it intended for use inside a container?
Also windows has power shell which has its own curl equivalent.
And no, even if you develop web apps you don't necessarily have Python installed. If I wrote node, or C#, or Go, or PHP exclusively, why would I bother with Python ? Sure there are some useful tools in Python, but it's absolutely not a given that you'll have it. Unlike on Linux, where Python is installed by default everywhere and you can basically assume Python is available.