src/java.base/share/classes/java/net/HttpConnectSocketImpl.java

*** 112,129 ****
          throws IOException
      {
          if (endpoint == null || !(endpoint instanceof InetSocketAddress))
              throw new IllegalArgumentException("Unsupported address type");
          final InetSocketAddress epoint = (InetSocketAddress)endpoint;
!         final String destHost = epoint.isUnresolved() ? epoint.getHostName()
                                                        : epoint.getAddress().getHostAddress();
          final int destPort = epoint.getPort();
  
          SecurityManager security = System.getSecurityManager();
          if (security != null)
              security.checkConnect(destHost, destPort);
  
          // Connect to the HTTP proxy server
          String urlString = "http://" + destHost + ":" + destPort;
          Socket httpSocket = privilegedDoTunnel(urlString, timeout);
  
          // Success!
--- 112,132 ----
          throws IOException
      {
          if (endpoint == null || !(endpoint instanceof InetSocketAddress))
              throw new IllegalArgumentException("Unsupported address type");
          final InetSocketAddress epoint = (InetSocketAddress)endpoint;
!         String destHost = epoint.isUnresolved() ? epoint.getHostName()
                                                  : epoint.getAddress().getHostAddress();
          final int destPort = epoint.getPort();
  
          SecurityManager security = System.getSecurityManager();
          if (security != null)
              security.checkConnect(destHost, destPort);
  
+         if (destHost.contains(":"))
+             destHost = "[" + destHost + "]";
+ 
          // Connect to the HTTP proxy server
          String urlString = "http://" + destHost + ":" + destPort;
          Socket httpSocket = privilegedDoTunnel(urlString, timeout);
  
          // Success!