How to properly use proxy in node.js?

Question

JavaScript

I have a list of proxies that need to be used in turn to access an external api.
I am doing this now:
var proxy_array = new Array();
for (var key in proxy) {
proxy_array.push(request.defaults({'proxy': proxy[key] }))
}
In proxy[key] - proxy address
Next, I use this simply by selecting an array element: proxy_array[0] proxy_array [1] and so on
Everything works, but if the application crashes/scheduled restart - connections to the proxy remain hanging and eventually run into the limit of simultaneous connections to the proxy.
And in general, such a solution does not seem very beautiful to me. How to solve the problem?