How to use Stream with hyper 0.12

Hello everyone, I tried to send multiple http requests simultaneously using hyper. So I did some searching on google and found a answer on stackoverflow: https://stackoverflow.com/questions/49087958/getting-multiple-urls-concurrently-with-hyper.

But it doesn't work with hyper 0.12: function keeps running after all requests are completed.

I'm not familiar with Stream and any help would be appreciated!