java - 如何将 Socks 5 代理与 Apache HTTP Client 4 一起使用？

Question

我正在尝试创建通过SOCKS5 代理通过Apache HC 4 发送HTTP 请求的应用程序。我不能使用应用程序全局代理，因为应用程序是多线程的(我需要为每个 HttpClient 实例使用不同的代理)。我没有发现 SOCKS5 与 HC4 一起使用的示例。我该如何使用它？

Answer 1

SOCK 是 TCP/IP 级别的代理协议(protocol)，而不是 HTTP。开箱即用的 HttpClient 不支持它。

可以自定义 HttpClient 以使用自定义连接套接字工厂通过 SOCKS 代理建立连接

编辑:更改为 SSL 而不是普通套接字

Registry<ConnectionSocketFactory> reg = RegistryBuilder.<ConnectionSocketFactory>create()
        .register("http", PlainConnectionSocketFactory.INSTANCE)
        .register("https", new MyConnectionSocketFactory(SSLContexts.createSystemDefault()))
        .build();
PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(reg);
CloseableHttpClient httpclient = HttpClients.custom()
        .setConnectionManager(cm)
        .build();
try {
    InetSocketAddress socksaddr = new InetSocketAddress("mysockshost", 1234);
    HttpClientContext context = HttpClientContext.create();
    context.setAttribute("socks.address", socksaddr);

    HttpHost target = new HttpHost("localhost", 80, "http");
    HttpGet request = new HttpGet("/");

    System.out.println("Executing request " + request + " to " + target + " via SOCKS proxy " + socksaddr);
    CloseableHttpResponse response = httpclient.execute(target, request, context);
    try {
        System.out.println("----------------------------------------");
        System.out.println(response.getStatusLine());
        EntityUtils.consume(response.getEntity());
    } finally {
        response.close();
    }
} finally {
    httpclient.close();
}

---

static class MyConnectionSocketFactory extends SSLConnectionSocketFactory {

    public MyConnectionSocketFactory(final SSLContext sslContext) {
        super(sslContext);
    }

    @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);
    }

}