InfiniteProxy

A .NET library that pulls free proxies from public sources, actively validates them, and keeps a live pool of ones that actually work.

It runs in the background, periodically refreshes the lists, and re-checks proxies that were working before. The goal is simple: give you working proxies when you ask for them instead of handing you dead ones from a scraped list.

Quick Start

Typical usage:

using InfiniteProxy;

var client = new InfiniteProxyClient();

// This starts the background scraping + checking and waits until
// at least one working proxy is available.
await client.WaitUntilReadyAsync();

var proxy = client.GetRandom(ProxyType.Http)!;

// Use it with HttpClient
var handler = new HttpClientHandler
{
    Proxy = new WebProxy(proxy.Host, proxy.Port),
    UseProxy = true
};
using var http = new HttpClient(handler);

var html = await http.GetStringAsync("https://example.com");

After WaitUntilReadyAsync() returns, the pool has at least one good proxy and the scanner continues running in the background.

Using a Proxy + Handling Failures

This is the pattern most people actually need.

using System.Net;

// Grab one
var proxy = client.GetRandom(ProxyType.Http);

if (proxy is null)
{
    // Pool is currently empty. Either wait or fall back to direct.
    await Task.Delay(TimeSpan.FromSeconds(2));
    proxy = client.GetRandom(ProxyType.Http);
}

// Set it up for HttpClient
var handler = new HttpClientHandler
{
    Proxy = new WebProxy(proxy.Host, proxy.Port),
    UseProxy = true
};

using var http = new HttpClient(handler)
{
    Timeout = TimeSpan.FromSeconds(20)
};

try
{
    var response = await http.GetAsync("https://api.example.com/data");
    response.EnsureSuccessStatusCode();

    var body = await response.Content.ReadAsStringAsync();
    Console.WriteLine(body);
}
catch (HttpRequestException ex)
{
    // The proxy failed during actual use (very common with free proxies).
    // Ask the client for a different one and retry, or surface the failure.
    Console.WriteLine($"Proxy {proxy.Address} died: {ex.Message}");

    var replacement = client.GetRandom(ProxyType.Http);
    if (replacement is not null && replacement.Address != proxy.Address)
    {
        // retry logic with replacement, or just let the caller try again on next request
    }
}

A few notes on this pattern:

• Free proxies die constantly. Treat them as ephemeral.
• GetRandom and GetFastest are fast — call them when you need one.
• Listen to ProxyRemoved if you want to know when the client itself evicts a bad one after re-checking.

Getting Different Kinds of Proxies

var httpProxy   = client.GetRandom(ProxyType.Http);
var socks5Proxy = client.GetRandom(ProxyType.Socks5);
var fastest     = client.GetFastest();           // across all types
var allHttp     = client.GetProxies(ProxyType.Http);

GetFastest() uses the latency measured during the last successful validation.

Configuration

new InfiniteProxyOptions
{
    ProxyTypes = [ProxyType.Http, ProxyType.Socks4, ProxyType.Socks5],
    FetchInterval = TimeSpan.FromMinutes(5),     // how often we ask for fresh lists
    RecheckInterval = TimeSpan.FromMinutes(15),  // how often we re-test proxies we already have
    MaxConcurrentChecks = 50,
    CheckTimeout = TimeSpan.FromSeconds(10),     // hard cap for an entire validation
    ConnectTimeout = TimeSpan.FromSeconds(6),    // time allowed just to reach the proxy
    HttpValidationUrl = new Uri("http://httpbin.org/ip"),
    SocksValidationHost = "httpbin.org",
    SocksValidationPort = 80,
    Country = null,      // "us", "de", etc. or null for worldwide
    SourceLimit = 2000
}

How Validation Works Now

• HTTP proxies: we make a real HTTP request through them.
• SOCKS4/SOCKS5: we do the proper CONNECT handshake and then send actual data over the tunnel. This filters out a lot of proxies that only pretend to work during the handshake.
• Proxies that were previously good get re-tested in the background. Bad ones are removed automatically.

We also use a separate connect timeout so a slow-to-respond proxy doesn't eat the whole check budget.

Custom Sources

You can add your own providers by implementing IProxySource. Pass them when constructing the client:

var client = new InfiniteProxyClient(options, new[]
{
    new ProxyScrapeSource(options),
    new MyOtherProxySource()
});

See IProxySource.cs for the two methods you need (FetchAsync and the optional GetInfoAsync for change detection).

When the Pool Is Empty

Nothing explodes. GetRandom / GetFastest just return null, and HasProxies is false.

The background loop keeps running and will surface new proxies through the ProxyAdded event when they become available.

Requirements

• .NET 8.0+
• Outbound network access (the whole point)

License

MIT. See LICENSE.