fix: increase the readTimeout value of the default OkHttpClient

With the previous value (10 seconds by default), a connection
established with HTTP long-polling was closed if the server did not
send any packet for 10 seconds (the HTTP request would timeout from the
client side).

It will now default to 1 minute, which is above the
`pingInterval + pingTimeout` value from the server.

Note: the connectTimeout and writeTimeout options are left as is (10
seconds), but you may need to increase them depending on your use case:

```
OkHttpClient client = new OkHttpClient.Builder()
	.connectTimeout(20, TimeUnit.SECONDS)
	.readTimeout(1, TimeUnit.MINUTES)
	.writeTimeout(1, TimeUnit.MINUTES)
        .build();
```

Related:

- https://github.com/socketio/socket.io-client-java/issues/491
- https://github.com/socketio/socket.io-client-java/issues/660

src/main/java/io/socket/engineio/client/Socket.java

@@ -206,16 +206,10 @@ public class Socket extends Emitter {
         this.callFactory = opts.callFactory != null ? opts.callFactory : defaultCallFactory;
         this.webSocketFactory = opts.webSocketFactory != null ? opts.webSocketFactory : defaultWebSocketFactory;
         if (callFactory == null) {
-            if (defaultOkHttpClient == null) {
-                defaultOkHttpClient = new OkHttpClient();
-            }
-            callFactory = defaultOkHttpClient;
+            callFactory = getDefaultOkHttpClient();
         }
         if (webSocketFactory == null) {
-            if (defaultOkHttpClient == null) {
-                defaultOkHttpClient = new OkHttpClient();
-            }
-            webSocketFactory = defaultOkHttpClient;
+            webSocketFactory = getDefaultOkHttpClient();
         }
         this.extraHeaders = opts.extraHeaders;
     }
@@ -228,6 +222,15 @@ public class Socket extends Emitter {
         defaultCallFactory = factory;
     }
 
+    private static OkHttpClient getDefaultOkHttpClient() {
+        if (defaultOkHttpClient == null) {
+            defaultOkHttpClient = new OkHttpClient.Builder()
+                    .readTimeout(1, TimeUnit.MINUTES) // defaults to 10 seconds
+                    .build();
+        }
+        return defaultOkHttpClient;
+    }
+
     /**
      * Connects the client.
      *

src/main/java/io/socket/engineio/client/transports/PollingXHR.java

@@ -2,7 +2,6 @@ package io.socket.engineio.client.transports;
 
 
 import java.io.IOException;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
@@ -18,7 +17,6 @@ import okhttp3.Call;
 import okhttp3.Callback;
 import okhttp3.HttpUrl;
 import okhttp3.MediaType;
-import okhttp3.OkHttpClient;
 import okhttp3.RequestBody;
 import okhttp3.Response;
 import okhttp3.ResponseBody;
@@ -160,7 +158,7 @@ public class PollingXHR extends Polling {
             this.method = opts.method != null ? opts.method : "GET";
             this.uri = opts.uri;
             this.data = opts.data;
-            this.callFactory = opts.callFactory != null ? opts.callFactory : new OkHttpClient();
+            this.callFactory = opts.callFactory;
             this.extraHeaders = opts.extraHeaders;
         }
 

src/main/java/io/socket/engineio/client/transports/WebSocket.java

@@ -7,7 +7,6 @@ import io.socket.engineio.parser.Parser;
 import io.socket.parseqs.ParseQS;
 import io.socket.thread.EventThread;
 import io.socket.yeast.Yeast;
-import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
 import okhttp3.WebSocketListener;
@@ -41,7 +40,6 @@ public class WebSocket extends Transport {
         this.emit(EVENT_REQUEST_HEADERS, headers);
 
         final WebSocket self = this;
-        okhttp3.WebSocket.Factory factory = webSocketFactory != null ? webSocketFactory : new OkHttpClient();
         Request.Builder builder = new Request.Builder().url(uri());
         for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
             for (String v : entry.getValue()) {
@@ -49,7 +47,7 @@ public class WebSocket extends Transport {
             }
         }
         final Request request = builder.build();
-        ws = factory.newWebSocket(request, new WebSocketListener() {
+        ws = webSocketFactory.newWebSocket(request, new WebSocketListener() {
             @Override
             public void onOpen(okhttp3.WebSocket webSocket, Response response) {
                 final Map<String, List<String>> headers = response.headers().toMultimap();