Shared proxies returning 407 status code error

[Patrick9263]

Hi! I've been trying to use shared proxies using the API, but I keep receiving the error:

tunneling socket could not be established, statusCode=407

I saw in the README the parameters to the API are:

const stockX = new StockXAPI({
    proxy: 'proxyhere',
    currency: 'USD',
    userAgent: 'Mozilla/5.0 (iPhone; CPU iPhone OS 12_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Mobile/15E148 Safari/604.1'
});

Where 'proxyhere' has the form (ip:port:user:pass). I was wondering if shared proxies that do not have passwords are supported? It's possible I just have it formatted incorrectly.. Just FYI, it does work properly for me with proxies that have a user and password.

Thanks!