diff --git a/pom.xml b/pom.xml
index 89731f5..3bcff6c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -41,6 +41,13 @@
             <version>1.5.2</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>1.7.25</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
 </project>
\ No newline at end of file
diff --git a/src/main/java/cn/montaro/aria2/Aria2Client.java b/src/main/java/cn/montaro/aria2/Aria2Client.java
index 60cf4cf..0b1a785 100644
--- a/src/main/java/cn/montaro/aria2/Aria2Client.java
+++ b/src/main/java/cn/montaro/aria2/Aria2Client.java
@@ -79,7 +79,7 @@ public interface Aria2Client {
     String getServers(String gid);
 
     @Aria2Method(Aria2MethodName.TELL_ACTIVE)
-    String tellActive(List<String> keys);
+    String tellActive(String... keys);
 
     @Aria2Method(Aria2MethodName.TELL_WAITING)
     String tellWaiting(int offset, int num, String... keys);
diff --git a/src/main/java/cn/montaro/aria2/client/websocket/Aria2WebSocketProxy.java b/src/main/java/cn/montaro/aria2/client/websocket/Aria2WebSocketProxy.java
index 5d1448c..b90b662 100644
--- a/src/main/java/cn/montaro/aria2/client/websocket/Aria2WebSocketProxy.java
+++ b/src/main/java/cn/montaro/aria2/client/websocket/Aria2WebSocketProxy.java
@@ -97,7 +97,9 @@ public class Aria2WebSocketProxy implements InvocationHandler {
 
     private <T> T sendRequest(Aria2WebSocketRequest request, Type resultType) {
         String id = request.getId();
-        webSocket.send(serializeRequest(request));
+        String body = serializeRequest(request);
+        log.debug("send body:{}", body);
+        webSocket.send(body);
         JsonObject returnResult = null;
         while ((returnResult = this.webSocket.getResponse(id)) == null) {
             Aria2WebSocketClientException exception = this.webSocket.getException(id);
@@ -106,6 +108,9 @@ public class Aria2WebSocketProxy implements InvocationHandler {
             }
         }
         JsonElement result = returnResult.get("result");
+        if (resultType.equals(String.class)) {
+            return (T) result.toString();
+        }
         return gson.fromJson(result, resultType);
     }
 
@@ -145,8 +150,8 @@ public class Aria2WebSocketProxy implements InvocationHandler {
 
         @Override
         public void onMessage(String message) {
-            JsonElement jsonElement = JsonParser.parseString(message);
-            JsonObject jsonObject = jsonElement.getAsJsonObject();
+            log.debug("receive message:{}", message);
+            JsonObject jsonObject = JsonParser.parseString(message).getAsJsonObject();
             String id = jsonObject.get("id").getAsString();
             if (id == null) {
                 return;
diff --git a/src/main/resources/simplelogger.properties b/src/main/resources/simplelogger.properties
new file mode 100644
index 0000000..5c89a5a
--- /dev/null
+++ b/src/main/resources/simplelogger.properties
@@ -0,0 +1 @@
+org.slf4j.simpleLogger.defaultLogLevel=DEBUG
\ No newline at end of file
diff --git a/src/test/java/Aria2WebSocketClientTest.java b/src/test/java/Aria2WebSocketClientTest.java
index a9c9f22..ee717e2 100644
--- a/src/test/java/Aria2WebSocketClientTest.java
+++ b/src/test/java/Aria2WebSocketClientTest.java
@@ -2,8 +2,11 @@ import cn.montaro.aria2.Aria2Client;
 import cn.montaro.aria2.Aria2ClientFactory;
 import cn.montaro.aria2.client.websocket.Aria2WebSocketConfig;
 import cn.montaro.aria2.client.websocket.Aria2WebSocketClient;
+import com.sun.org.apache.xpath.internal.SourceTree;
 import org.junit.Test;
 
+import javax.lang.model.element.VariableElement;
+import java.sql.Array;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
@@ -16,11 +19,32 @@ import java.util.Map;
  */
 public class Aria2WebSocketClientTest {
 
+    Aria2WebSocketConfig config = new Aria2WebSocketConfig().setSecret("123456");
+    Aria2Client client = Aria2ClientFactory.webSocketClient(config);
+
     @Test
-    public void test() {
-        Aria2WebSocketConfig config = new Aria2WebSocketConfig().setSecret("123456");
-        Aria2Client client = Aria2ClientFactory.webSocketClient(config);
-        String version = client.getVersion();
-        System.out.println(version);
+    public void tellActive() {
+        String s = client.tellActive();
+        System.out.println(s);
+    }
+
+    @Test
+    public void tellWaiting() {
+        String s = client.tellWaiting(0, 1000, null);
+        System.out.println(s);
+    }
+
+    @Test
+    public void getGlobalStat(){
+        String globalStat = client.getGlobalStat();
+        System.out.println(globalStat);
+    }
+
+    @Test
+    public void changeUri() {
+        List<String> addUris = new ArrayList<String>();
+        addUris.add("https://mirrors.tuna.tsinghua.edu.cn/centos/8.5.2111/isos/x86_64/CentOS-8.5.2111-x86_64-dvd1.iso");
+        String result = client.changeUri("97d4d126a7263df8", 1, new ArrayList<String>(), addUris);
+        System.out.println(result);
     }
 }