diff --git a/README.md b/README.md
index 3ee04e0b..6bd26d21 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ Run test:
 | 4   	| Proto Root Directory              	| Root directory contains proto files                                 	|
 | 5   	| Library Directory (Optional)      	| Using a different underlying library (googleapis)                   	|
 | 6   	| Full Method                       	| Full Method to test                                                 	|
-| 7   	| Metadata                          	| Store token, authentication method, format: key1:value1,key2:value2                                  	|
+| 7   	| Metadata                          	| Store token, authentication method, format: key1:value1,key2:value2, value should url encode with utf-8                                  	|
 | 8   	| Deadline                          	| How long gRPC clients are willing to wait for an RPC to complete  	|
 | 9   	| Send JSON Format With the Request 	| Data request with JSON format                                       	|
 
diff --git a/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java b/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java
index 9033d937..99c9e469 100644
--- a/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java
+++ b/src/main/java/vn/zalopay/benchmark/core/ClientCaller.java
@@ -21,6 +21,9 @@
 import vn.zalopay.benchmark.core.protobuf.ServiceResolver;
 import vn.zalopay.benchmark.core.specification.GrpcResponse;
 
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
@@ -90,7 +93,13 @@ private Map<String, String> buildHashMetadata(String metadata) {
             Preconditions.checkArgument(keyValue.length == 2,
                     "Metadata entry must be defined in key1:value1,key2:value2 format: " + metadata);
 
-            metadataHash.put(keyValue[0], keyValue[1]);
+            String value = keyValue[1];
+            try {
+                value = URLDecoder.decode(keyValue[1], StandardCharsets.UTF_8.name());
+            } catch (UnsupportedEncodingException ignored) {
+            }
+
+            metadataHash.put(keyValue[0], value);
         }
 
         return metadataHash;
diff --git a/src/test/java/vn/zalopay/benchmark/core/client/ClientCallerTest.java b/src/test/java/vn/zalopay/benchmark/core/client/ClientCallerTest.java
index 8f5cb46d..d0af1286 100644
--- a/src/test/java/vn/zalopay/benchmark/core/client/ClientCallerTest.java
+++ b/src/test/java/vn/zalopay/benchmark/core/client/ClientCallerTest.java
@@ -16,6 +16,10 @@
 
 import javax.net.ssl.SSLException;
 
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+
 import static org.mockito.Mockito.any;
 
 public class ClientCallerTest extends BaseTest {
@@ -108,6 +112,16 @@ public void testCanSendGrpcUnaryRequestWithMetaData() {
         Assert.assertTrue(resp.getGrpcMessageString().contains("\"theme\": \"Hello server"));
     }
 
+    @Test
+    public void testCanSendGrpcUnaryRequestWithEncodedMetaData() throws UnsupportedEncodingException {
+        clientCaller = new ClientCaller(HOST_PORT, PROTO_WITH_EXTERNAL_IMPORT_FOLDER.toString(), LIB_FOLDER.toString(), FULL_METHOD, false, false, "tracestate:" + URLEncoder.encode("a=3,b:4", StandardCharsets.UTF_8.name()));
+        clientCaller.buildRequest(REQUEST_JSON);
+        GrpcResponse resp = clientCaller.call("2000");
+        clientCaller.shutdownNettyChannel();
+        Assert.assertNotNull(resp);
+        Assert.assertTrue(resp.getGrpcMessageString().contains("\"theme\": \"Hello server"));
+    }
+
     @Test
     public void testCanSendGrpcUnaryRequestWithSSLAndDisableSSLVerification() {
         clientCaller = new ClientCaller(HOST_PORT_TLS, PROTO_WITH_EXTERNAL_IMPORT_FOLDER.toString(), LIB_FOLDER.toString(), FULL_METHOD, true, true, METADATA);