How to use Socks 5 proxy with Apache HTTP Client 4?

Question

I\'m trying to create app that sends HTTP requests via Apache HC 4 via SOCKS5 proxy. I can not use app-global

Answer 1

The answer above works pretty well, unless your country poisons DNS records as well. It is very difficult to say Java "do not use my DNS servers while connecting through proxy" as addressed in these two questions:

java runtime 6 with socks v5 proxy - Possible?

How to get URL connection using proxy in java?

It is also difficult for Apache HttpClient, since it also tries to resolve host names locally. By some modification to the code above, this can be dealt with:

static class FakeDnsResolver implements DnsResolver {
    @Override
    public InetAddress[] resolve(String host) throws UnknownHostException {
        // Return some fake DNS record for every request, we won't be using it
        return new InetAddress[] { InetAddress.getByAddress(new byte[] { 1, 1, 1, 1 }) };
    }
}

static class MyConnectionSocketFactory extends PlainConnectionSocketFactory {
    @Override
    public Socket createSocket(final HttpContext context) throws IOException {
        InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
        Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
        return new Socket(proxy);
    }

    @Override
    public Socket connectSocket(int connectTimeout, Socket socket, HttpHost host, InetSocketAddress remoteAddress,
            InetSocketAddress localAddress, HttpContext context) throws IOException {
        // Convert address to unresolved
        InetSocketAddress unresolvedRemote = InetSocketAddress
                .createUnresolved(host.getHostName(), remoteAddress.getPort());
        return super.connectSocket(connectTimeout, socket, host, unresolvedRemote, localAddress, context);
    }
}

static class MySSLConnectionSocketFactory extends SSLConnectionSocketFactory {

    public MySSLConnectionSocketFactory(final SSLContext sslContext) {
        // You may need this verifier if target site's certificate is not secure
        super(sslContext, ALLOW_ALL_HOSTNAME_VERIFIER);
    }

    @Override
    public Socket createSocket(final HttpContext context) throws IOException {
        InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
        Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
        return new Socket(proxy);
    }

    @Override
    public Socket connectSocket(int connectTimeout, Socket socket, HttpHost host, InetSocketAddress remoteAddress,
            InetSocketAddress localAddress, HttpContext context) throws IOException {
        // Convert address to unresolved
        InetSocketAddress unresolvedRemote = InetSocketAddress
                .createUnresolved(host.getHostName(), remoteAddress.getPort());
        return super.connectSocket(connectTimeout, socket, host, unresolvedRemote, localAddress, context);
    }
}

---

public static void main(String[] args) throws Exception {
    Registry reg = RegistryBuilder. create()
            .register("http", new MyConnectionSocketFactory())
            .register("https", new MySSLConnectionSocketFactory(SSLContexts.createSystemDefault())).build();
    PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(reg, new FakeDnsResolver());
    CloseableHttpClient httpclient = HttpClients.custom().setConnectionManager(cm).build();
    try {
        InetSocketAddress socksaddr = new InetSocketAddress("mysockshost", 1234);
        HttpClientContext context = HttpClientContext.create();
        context.setAttribute("socks.address", socksaddr);

        HttpGet request = new HttpGet("https://www.funnyordie.com");

        System.out.println("Executing request " + request + " via SOCKS proxy " + socksaddr);
        CloseableHttpResponse response = httpclient.execute(request, context);
        try {
            System.out.println("----------------------------------------");
            System.out.println(response.getStatusLine());
            int i = -1;
            InputStream stream = response.getEntity().getContent();
            while ((i = stream.read()) != -1) {
                System.out.print((char) i);
            }
            EntityUtils.consume(response.getEntity());
        } finally {
            response.close();
        }
    } finally {
        httpclient.close();
    }
}