diff --git a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java
index f509bbb..f717dff 100644
--- a/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java
+++ b/client-libraries/java/rest-client/src/com/google/android/gcm/server/Sender.java
@@ -15,61 +15,22 @@
  */
 package com.google.android.gcm.server;
 
-import static com.google.android.gcm.server.Constants.JSON_CANONICAL_IDS;
-import static com.google.android.gcm.server.Constants.JSON_ERROR;
-import static com.google.android.gcm.server.Constants.JSON_FAILURE;
-import static com.google.android.gcm.server.Constants.JSON_MESSAGE_ID;
-import static com.google.android.gcm.server.Constants.JSON_MULTICAST_ID;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_BADGE;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_BODY;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_BODY_LOC_ARGS;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_BODY_LOC_KEY;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_CLICK_ACTION;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_COLOR;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_ICON;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_SOUND;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_TAG;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_TITLE;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_TITLE_LOC_ARGS;
-import static com.google.android.gcm.server.Constants.JSON_NOTIFICATION_TITLE_LOC_KEY;
-import static com.google.android.gcm.server.Constants.JSON_PAYLOAD;
-import static com.google.android.gcm.server.Constants.JSON_REGISTRATION_IDS;
-import static com.google.android.gcm.server.Constants.JSON_TO;
-import static com.google.android.gcm.server.Constants.JSON_RESULTS;
-import static com.google.android.gcm.server.Constants.JSON_SUCCESS;
-import static com.google.android.gcm.server.Constants.PARAM_COLLAPSE_KEY;
-import static com.google.android.gcm.server.Constants.PARAM_DELAY_WHILE_IDLE;
-import static com.google.android.gcm.server.Constants.PARAM_DRY_RUN;
-import static com.google.android.gcm.server.Constants.PARAM_PRIORITY;
-import static com.google.android.gcm.server.Constants.PARAM_CONTENT_AVAILABLE;
-import static com.google.android.gcm.server.Constants.PARAM_RESTRICTED_PACKAGE_NAME;
-import static com.google.android.gcm.server.Constants.PARAM_TIME_TO_LIVE;
-import static com.google.android.gcm.server.Constants.TOKEN_CANONICAL_REG_ID;
-import static com.google.android.gcm.server.Constants.TOPIC_PREFIX;
-
 import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 import org.json.simple.JSONValue;
 import org.json.simple.parser.JSONParser;
 import org.json.simple.parser.ParseException;
 
-import java.io.BufferedReader;
-import java.io.Closeable;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
+import java.io.*;
 import java.net.HttpURLConnection;
+import java.net.Proxy;
 import java.net.URL;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Random;
+import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import static com.google.android.gcm.server.Constants.*;
+
 /**
  * Helper class to send messages to the GCM service using an API Key.
  */
@@ -91,8 +52,9 @@ public class Sender {
       Logger.getLogger(Sender.class.getName());
 
   private final String key;
+    private  Proxy proxy;
 
-  private String endpoint;
+    private String endpoint;
 
   private int connectTimeout;
   private int readTimeout;
@@ -112,11 +74,24 @@ public Sender(String key) {
    * @param key FCM Server Key obtained through the Firebase Web Console.
    * @param endpoint Endpoint to use when sending the message.
    */
-  public Sender(String key, String endpoint) {
+  public Sender(String key,  String endpoint) {
     this.key = nonNull(key);
     this.endpoint = nonNull(endpoint);
   }
 
+    /**
+     * Full options constructor.
+     *
+     * @param key FCM Server Key obtained through the Firebase Web Console.
+     * @param Proxy proxy to use when sending the message.
+     * @param endpoint Endpoint to use when sending the message.
+     */
+    public Sender(String key, Proxy proxy, String endpoint) {
+        this.key = nonNull(key);
+        this.endpoint = nonNull(endpoint);
+        this.proxy = proxy;
+    }
+
   public String getEndpoint() {
     return endpoint;
   }
@@ -671,8 +646,18 @@ protected static void addParameter(StringBuilder body, String name,
   /**
    * Gets an {@link HttpURLConnection} given an URL.
    */
-  protected HttpURLConnection getConnection(String url) throws IOException {
-    HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
+  protected HttpURLConnection getConnection(String url) throws IOException
+  {
+
+    HttpURLConnection conn;
+    if( proxy != null)
+    {
+        conn = (HttpURLConnection) new URL(url).openConnection(proxy);
+    }
+    else
+    {
+        conn = (HttpURLConnection) new URL(url).openConnection();
+    }
     conn.setConnectTimeout(connectTimeout);
     conn.setReadTimeout(readTimeout);
     return conn;