add open source header

Author: ByteDanceLiuYang

src/main/java/com/volcengine/vikingdb/runtime/Util.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime;
 
 import com.volcengine.vikingdb.runtime.core.Const;

src/main/java/com/volcengine/vikingdb/runtime/Version.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime;
 
 import lombok.Getter;

src/main/java/com/volcengine/vikingdb/runtime/core/ApiClient.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import com.fasterxml.jackson.annotation.JsonInclude;

src/main/java/com/volcengine/vikingdb/runtime/core/ClientConfig.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import com.volcengine.vikingdb.runtime.core.retry.ExpBackoffStrategy;

src/main/java/com/volcengine/vikingdb/runtime/core/Const.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 public class Const {

src/main/java/com/volcengine/vikingdb/runtime/core/RequestAddition.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import lombok.Getter;

src/main/java/com/volcengine/vikingdb/runtime/core/RequestExecutor.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import com.volcengine.vikingdb.runtime.Util;

src/main/java/com/volcengine/vikingdb/runtime/core/RequestExecutorWithAkSk.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import com.volcengine.service.SignableRequest;

src/main/java/com/volcengine/vikingdb/runtime/core/RequestExecutorWithApiKey.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import com.volcengine.vikingdb.runtime.enums.Method;

src/main/java/com/volcengine/vikingdb/runtime/core/RequestExecutorWithNoAuth.java

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: Apache-2.0 
+
 package com.volcengine.vikingdb.runtime.core;
 
 import com.volcengine.vikingdb.runtime.enums.Method;