title: how to use Socks4/5 Proxy Handlers in Netty Client (4.1)
body: <p>I need to configure socks proxy in Netty client (to request different sites via socks4 or 5 proxies).
  Tried a lot of proxies from free socks lists (like www.socks-proxy.net, <a href="http://sockslist.net/" rel="noreferrer">http://sockslist.net/</a> etc) but with no luck:</p>
  
  <pre><code>@Test
  public void testProxy() throws Exception {
      final String ua = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36";
      final String host = "www.main.de";
      final int port = 80;
  
      Bootstrap b = new Bootstrap();
      b.group(new NioEventLoopGroup())
              .channel(NioSocketChannel.class)
              .handler(new ChannelInitializer&lt;SocketChannel&gt;() {
                  @Override
                  protected void initChannel(SocketChannel ch) throws Exception {
                      ChannelPipeline p = ch.pipeline();
  
                      p.addLast(new HttpClientCodec());
                      p.addLast(new HttpContentDecompressor());
                      p.addLast(new HttpObjectAggregator(10_485_760));
                      p.addLast(new ChannelInboundHandlerAdapter() {
                          @Override
                          public void channelActive(final ChannelHandlerContext ctx) throws Exception {
                              HttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, GET, "/");
                              request.headers().set(HOST, host + ":" + port);
                              request.headers().set(USER_AGENT, ua);
                              request.headers().set(CONNECTION, CLOSE);
  
                              ctx.writeAndFlush(request);
  
                              System.out.println("!sent");
                          }
  
                          @Override
                          public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                              System.out.println("!answer");
                              if (msg instanceof FullHttpResponse) {
                                  FullHttpResponse httpResp = (FullHttpResponse) msg;
  
  
                                  ByteBuf content = httpResp.content();
                                  String strContent = content.toString(UTF_8);
                                  System.out.println("body: " + strContent);
  
                                  finish.countDown();
                                  return;
                              }
  
                              super.channelRead(ctx, msg);
                          }
  
                          @Override
                          public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                              cause.printStackTrace(System.err);
                              ctx.close();
                              finish.countDown();
                          }
                      });
  
                      p.addLast(new Socks4ProxyHandler(new InetSocketAddress("149.202.68.167", 37678)));
                  }
              });
  
      b.connect(host, port).awaitUninterruptibly();
      System.out.println("!connected");
  
      finish.await(1, MINUTES);
  }
  </code></pre>
  
  <p>The connection hangs, resets or getting some strange exceptions.
  What's wrong?
  Proxy support added to Netty since 4.1 (now there is a 4.1CR, tried it and 4.1b7-8 before)</p>