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I'm trying to create app that sends HTTP requests via Apache HC 4 via SOCKS5 proxy.
I can not use app-global proxy, because app is multi-threaded (I need different proxy for each HttpClient instance). I've found no examples of SOCKS5 usage with HC4. How can I use it?
SOCK is a TCP/IP level proxy protocol, not HTTP. It is not supported by HttpClient out of the box.
One can customize HttpClient to establish connections via a SOCKS proxy by using a custom connection socket factory
EDIT: changes to SSL instead of plain sockets
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);
}
}