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diff --git a/src/main/java/org/onap/msb/sdk/httpclient/RetrofitServiceUtils.java b/src/main/java/org/onap/msb/sdk/httpclient/RetrofitServiceUtils.java
new file mode 100644
index 0000000..229efd8
--- /dev/null
+++ b/src/main/java/org/onap/msb/sdk/httpclient/RetrofitServiceUtils.java
@@ -0,0 +1,122 @@
+/*******************************************************************************
+ * Copyright 2017 ZTE, Inc. and others.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ ******************************************************************************/
+package org.onap.msb.sdk.httpclient;
+
+import java.security.SecureRandom;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSession;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+
+import org.onap.msb.sdk.httpclient.conf.HttpClientConf;
+
+import okhttp3.OkHttpClient;
+
+/**
+ * @author 10071214
+ *
+ */
+public class RetrofitServiceUtils {
+
+
+
+  private static Map<HttpClientConf, OkHttpClient> httpMap = new HashMap<>();
+
+  private static Map<HttpClientConf, OkHttpClient> httpsMap = new HashMap<>();
+
+  public synchronized static OkHttpClient buildDefaultOkHttpsClient(HttpClientConf httpClientConf)
+      throws Exception {
+
+    if (!httpsMap.containsKey(httpClientConf)) {
+      OkHttpClient httpsOkHttpClient = buildOkHttpsClient(httpClientConf);
+      httpsMap.put(httpClientConf, httpsOkHttpClient);
+    }
+    return httpsMap.get(httpClientConf);
+  }
+
+
+  public synchronized static OkHttpClient buildDefaultOkHttpClient(HttpClientConf httpClientConf)
+      throws Exception {
+
+    if (!httpMap.containsKey(httpClientConf)) {
+      OkHttpClient httpOkHttpClient = buildOkHttpClient(httpClientConf);
+      httpMap.put(httpClientConf, httpOkHttpClient);
+    }
+
+    return httpMap.get(httpClientConf);
+  }
+
+
+
+  private static OkHttpClient buildOkHttpsClient(HttpClientConf httpClientConf) throws Exception {
+
+    if (httpClientConf == null) {
+      httpClientConf = new HttpClientConf();
+    }
+
+    TrustManager[] trustManager = new TrustManager[] {new X509TrustManager() {
+      @Override
+      public void checkClientTrusted(X509Certificate[] chain, String authType)
+          throws CertificateException {}
+
+      @Override
+      public void checkServerTrusted(X509Certificate[] chain, String authType)
+          throws CertificateException {}
+
+      @Override
+      public X509Certificate[] getAcceptedIssuers() {
+        return new X509Certificate[0];
+      }
+    }};
+
+    SSLContext sslContext = SSLContext.getInstance("SSL");
+    sslContext.init(null, trustManager, new SecureRandom());
+    SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
+
+
+
+    return new OkHttpClient.Builder()
+        .connectTimeout(httpClientConf.getConnectTimeout(), TimeUnit.MILLISECONDS)
+        .readTimeout(httpClientConf.getReadTimeout(), TimeUnit.MILLISECONDS)
+        .writeTimeout(httpClientConf.getWriteTimeout(), TimeUnit.MILLISECONDS)
+        .sslSocketFactory(sslSocketFactory).hostnameVerifier(new HostnameVerifier() {
+          @Override
+          public boolean verify(String hostname, SSLSession session) {
+            return true;
+          }
+        }).build();
+  }
+
+
+  private static OkHttpClient buildOkHttpClient(HttpClientConf httpClientConf) throws Exception {
+
+    if (httpClientConf == null) {
+      httpClientConf = new HttpClientConf();
+    }
+
+    return new OkHttpClient.Builder()
+        .connectTimeout(httpClientConf.getConnectTimeout(), TimeUnit.MILLISECONDS)
+        .readTimeout(httpClientConf.getReadTimeout(), TimeUnit.MILLISECONDS)
+        .writeTimeout(httpClientConf.getWriteTimeout(), TimeUnit.MILLISECONDS).build();
+  }
+
+}