add new Options for feeding custom OkHttpClient

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

@@ -8,6 +8,8 @@ import com.github.nkzawa.engineio.parser.Packet;
 import com.github.nkzawa.engineio.parser.Parser;
 import com.github.nkzawa.parseqs.ParseQS;
 import com.github.nkzawa.thread.EventThread;
+import com.squareup.okhttp.OkHttpClient;
+
 import org.json.JSONException;
 
 import javax.net.ssl.SSLContext;
@@ -121,6 +123,7 @@ public class Socket extends Emitter {
     private Future pingTimeoutTimer;
     private Future pingIntervalTimer;
     private SSLContext sslContext;
+    private OkHttpClient okHttpClient;
 
     private ReadyState readyState;
     private ScheduledExecutorService heartbeatScheduler;
@@ -197,6 +200,7 @@ 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.okHttpClient = opts.okHttpClient;
     }
 
     /**
@@ -254,6 +258,7 @@ public class Socket extends Emitter {
         opts.timestampParam = this.timestampParam;
         opts.policyPort = this.policyPort;
         opts.socket = this;
+        opts.okHttpClient = this.okHttpClient;
 
         if (WebSocket.NAME.equals(name)) {
             return new WebSocket(opts);

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

@@ -5,6 +5,7 @@ import com.github.nkzawa.emitter.Emitter;
 import com.github.nkzawa.engineio.parser.Packet;
 import com.github.nkzawa.engineio.parser.Parser;
 import com.github.nkzawa.thread.EventThread;
+import com.squareup.okhttp.OkHttpClient;
 
 import javax.net.ssl.SSLContext;
 import java.util.Map;
@@ -42,6 +43,7 @@ public abstract class Transport extends Emitter {
     protected String timestampParam;
     protected SSLContext sslContext;
     protected Socket socket;
+    protected OkHttpClient okHttpClient;
 
     protected ReadyState readyState;
 
@@ -55,6 +57,7 @@ public abstract class Transport extends Emitter {
         this.timestampRequests = opts.timestampRequests;
         this.sslContext = opts.sslContext;
         this.socket = opts.socket;
+        this.okHttpClient = opts.okHttpClient;
     }
 
     protected Transport onError(String msg, Exception desc) {
@@ -144,6 +147,7 @@ public abstract class Transport extends Emitter {
         public int policyPort = -1;
         public Map<String, String> query;
         public SSLContext sslContext;
+        public OkHttpClient okHttpClient;
         protected Socket socket;
     }
 }

src/main/java/com/github/nkzawa/engineio/client/transports/WebSocket.java

@@ -48,7 +48,7 @@ public class WebSocket extends Transport {
         this.emit(EVENT_REQUEST_HEADERS, headers);
 
         final WebSocket self = this;
-        final OkHttpClient client = new OkHttpClient();
+        final OkHttpClient client = this.okHttpClient != null ? this.okHttpClient : new OkHttpClient();
         if (this.sslContext != null) {
             SSLSocketFactory factory = sslContext.getSocketFactory();// (SSLSocketFactory) SSLSocketFactory.getDefault();
             client.setSslSocketFactory(factory);