using different proxy with each request

Dear All , 
I know that I can set the proxy with 

```
$queue = new \cURL\RequestsQueue;
$queue
    ->getDefaultOptions()
    ->set(CURLOPT_RETURNTRANSFER, true)
    ->set(CURLOPT_PROXY, $proxy)
   ->set(CURLOPT_FRESH_CONNECT,true);
```
But this queue setting will be used with each request.
I need to use a different proxy with each request, how can I setup such?
