Rotation strategies

[josearodrigueze]

By default the rotation strategy is ROUND ROBIN, but support can be added to make it parametric, in order to address use cases that require proxies from certain specific countries and not just any of the pool.

For example
curl https://httpbin.org/ip --proxy http://127.0.0.1:3128?country=us,co,mx

and with those parameters use the proxies that meet the condition.

Thank you very much in advance for your consideration.