add setDefaultHostnameVerifier

src/main/java/com/github/nkzawa/engineio/client/Socket.java

@@ -98,6 +98,7 @@ public class Socket extends Emitter {
     private static boolean priorWebsocketSuccess = false;
 
     private static SSLContext defaultSSLContext;
+    private static HostnameVerifier defaultHostnameVerifier;
 
     private boolean secure;
     private boolean upgrade;
@@ -131,6 +132,10 @@ public class Socket extends Emitter {
         defaultSSLContext = sslContext;
     }
 
+    public static void setDefaultHostnameVerifier(HostnameVerifier hostnameVerifier) {
+        defaultHostnameVerifier = hostnameVerifier;
+    }
+
     public Socket() {
         this(new Options());
     }
@@ -199,7 +204,7 @@ public class Socket extends Emitter {
                 opts.transports : new String[]{Polling.NAME, WebSocket.NAME}));
         this.policyPort = opts.policyPort != 0 ? opts.policyPort : 843;
         this.rememberUpgrade = opts.rememberUpgrade;
-        this.hostnameVerifier = opts.hostnameVerifier;
+        this.hostnameVerifier = opts.hostnameVerifier != null ? opts.hostnameVerifier : defaultHostnameVerifier;
     }
 
     /**

src/test/java/com/github/nkzawa/engineio/client/SSLConnectionTest.java

@@ -126,9 +126,8 @@ public class SSLConnectionTest extends Connection {
         final BlockingQueue<Object> values = new LinkedBlockingQueue<Object>();
 
         Socket.setDefaultSSLContext(createSSLContext());
-        Socket.Options opts = createOptions();
-        opts.hostnameVerifier = SSLConnectionTest.hostnameVerifier;
-        socket = new Socket(opts);
+        Socket.setDefaultHostnameVerifier(SSLConnectionTest.hostnameVerifier);
+        socket = new Socket(createOptions());
         socket.on(Socket.EVENT_OPEN, new Emitter.Listener() {
             @Override
             public void call(Object... args) {