curl --proxy go.proxylon.com:2222 --proxy-user username:password "http://www.any-website.com"

$curl = curl_init('http://www.any-website.com');
curl_setopt($curl, CURLOPT_PROXY, 'http://go.proxylon.com:2222');
curl_setopt($curl, CURLOPT_PROXYUSERPWD, 'username:password');
curl_exec($curl);

#!/usr/bin/env python
import sys
if sys.version_info[0]==2:
    import six
    from six.moves.urllib import request
    opener = request.build_opener(
        request.ProxyHandler(
            {'http': 'http://username:password@go.proxylon.com:2222'}))
    print(opener.open('http://www.any-website.com').read())
if sys.version_info[0]==3:
    import urllib.request
    opener = urllib.request.build_opener(
        urllib.request.ProxyHandler(
            {'http': 'http://username:password@go.proxylon.com:2222'}))
    print(opener.open('http://www.any-website.com').read())

package example;

import org.apache.http.HttpHost;
import org.apache.http.client.fluent.*;

public class Example {
    public static void main(String[] args) throws Exception {
        HttpHost proxy = new HttpHost("go.proxylon.com:2222);
        String res = Executor.newInstance()
            .auth(proxy, "username:password")
            .execute(Request.Get("http://www.any-website.com").viaProxy(proxy))
            .returnContent().asString();
        System.out.println(res);
    }
}

#!/usr/bin/env node
require('request-promise')({
    url: 'http://www.any-website.com',
    proxy: 'http://username:password@go.proxylon.com:2222'
}).then(function(data){ console.log(data); }, function(err){ console.error(err); });