zproxy | ZEVENET L7 load balancing proxy core

I'm trying to optimize requests through an external proxy (rotator). Sometimes the response is fast, sometimes very slow. So the idea is to send multiple requests in parallel of the same url request, take the fastest response, return the data, close the function without waiting for the other slower response(s).

There are a lot of tutorials online and SO questions regarding parallel requests in python, but all of them are for parallel requests of different requests instead of a duplicate request. Additionally the code waits until all requests are finished. I want to kind kill the parallel requests logic (preferably in a clean way) once the fastest response answers.

My app is running in Python Flask and runs with Gunicorn + Eventlet. I tried Eventlet green pools and Python Concurrent Futures, but using an Eventlet Greenpool seems like a better match, since the code will run in Gunicorn + Eventlet workers and Celery with Eventlet workers.

Im currently using Luminati Proxy Manager (LPM) to retry failed requests. An older version seemed to support parallel requests in the box, but the current versions do not support this function anymore. So I'm either trying to solve it with code in my Python app, or add another service/ tool (like LPM) that takes care of parallel requests and picks the fastest one.

Proxy service Luminati.io provides a 'high performance parallel request' code example (based on Eventlet Greenpool). See 'original example'

I edited to code without a proxy and login's to make it more repeatable and avoid unpredictable proxy response timings. I'm not getting any support from Luminati, so I'm trying figure it out on SO. For this test I'm using simulated slow 5 sec response, and a fast response from httpstat.us: