diff --git a/class/transport.php b/class/transport.php
index 5c64c3f..43378ff 100644
--- a/class/transport.php
+++ b/class/transport.php
@@ -10,6 +10,15 @@
 if (false === defined('CS_REST_CALL_TIMEOUT')) {
     define('CS_REST_CALL_TIMEOUT', 20);
 }
+if (false === defined('CS_REST_PROXY')) {
+  define('CS_REST_PROXY', '');
+}
+if (false === defined('CS_REST_PROXY_PORT')) {
+  define('CS_REST_PROXY_PORT', '');
+}
+if (false === defined('CS_REST_NO_PROXY')) {
+  define('CS_REST_NO_PROXY', '');
+}
 
 if(!function_exists("CS_REST_TRANSPORT_get_available")) {    
     function CS_REST_TRANSPORT_get_available($requires_ssl, $log) {
@@ -164,6 +173,11 @@ function make_call($call_options) {
                 curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
             }
 
+            // Add proxy settings.
+            curl_setopt($ch, CURLOPT_PROXY, CS_REST_PROXY);
+            curl_setopt($ch, CURLOPT_PROXYPORT, CS_REST_PROXY_PORT);
+            curl_setopt($ch, CURLOPT_NOPROXY, CS_REST_NO_PROXY);
+
             $response = curl_exec($ch);
 
             if(!$response && $response !== '') {
@@ -349,4 +363,4 @@ function _build_request($call_options, $host, $path, $accept_gzip) {
             return $request."\n\n";
         }
     }
-}
\ No newline at end of file
+}