diff --git a/ChargeBee/Api/ApiConfig.cs b/ChargeBee/Api/ApiConfig.cs
index 1d6efd1..6744da9 100644
--- a/ChargeBee/Api/ApiConfig.cs
+++ b/ChargeBee/Api/ApiConfig.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Net.Http;
 using System.Text;
 using ChargeBee.Internal;
 using Newtonsoft.Json.Linq;
@@ -19,6 +20,8 @@ public sealed class ApiConfig
         public string Charset { get; set; }
         public static int ConnectTimeout { get; set; }
         public string BaseUrl { get; set; }
+        
+        public static HttpMessageHandler HttpMessageHandler { get; set; }
 
         public string ApiBaseUrl
         {
@@ -46,7 +49,7 @@ public string AuthValue
             }
         }
 
-        public ApiConfig(string siteName, string apiKey)
+        public ApiConfig(string siteName, string apiKey, HttpMessageHandler httpMessageHandler = null)
         {
 
             if (String.IsNullOrEmpty(siteName))
@@ -61,13 +64,14 @@ public ApiConfig(string siteName, string apiKey)
             ExportSleepMillis = 10000;
             SiteName = siteName;
             ApiKey = apiKey;
+            HttpMessageHandler = httpMessageHandler;
         }
 
         private static volatile ApiConfig m_instance;
 
-        public static void Configure(string siteName, string apiKey)
+        public static void Configure(string siteName, string apiKey, HttpMessageHandler httpMessageHandler = null)
         {         
-            m_instance = new ApiConfig(siteName, apiKey);
+            m_instance = new ApiConfig(siteName, apiKey, httpMessageHandler);
         }
 
         public static void SetBaseUrl(string url)
diff --git a/ChargeBee/Api/ApiUtil.cs b/ChargeBee/Api/ApiUtil.cs
index 39b9350..4e593ca 100644
--- a/ChargeBee/Api/ApiUtil.cs
+++ b/ChargeBee/Api/ApiUtil.cs
@@ -18,7 +18,12 @@ namespace ChargeBee.Api
     public static class ApiUtil
     {
         private static DateTime m_unixTime = new DateTime(1970, 1, 1);
-        private static HttpClient httpClient = new HttpClient() { Timeout = TimeSpan.FromMilliseconds(0 < ApiConfig.ConnectTimeout ? ApiConfig.ConnectTimeout : 30000) };
+
+        private static readonly HttpClient httpClient =
+            new HttpClient(ApiConfig.HttpMessageHandler ?? new HttpClientHandler())
+            {
+                Timeout = TimeSpan.FromMilliseconds(0 < ApiConfig.ConnectTimeout ? ApiConfig.ConnectTimeout : 30000)
+            };
 
         public static string BuildUrl(params string[] paths)
         {
@@ -31,6 +36,7 @@ public static string BuildUrl(params string[] paths)
                 else
                     sb.Append('/').Append(Uri.EscapeDataString(path));
             }
+
             return sb.ToString();
         }
         private static HttpRequestMessage BuildRequest(string uri, HttpMethod method, Params parameters, ApiConfig env, bool supportsFilter)
@@ -59,6 +65,7 @@ private static HttpRequestMessage GetRequestMessage(string url, HttpMethod metho
             AddCustomHeaders(request, headers);
             return request;
         }
+
         private static void AddHeaders(HttpRequestMessage request, ApiConfig env)
         {
             request.Headers.Add("Accept-Charset", env.Charset);