diff --git a/Vonage/Configuration.cs b/Vonage/Configuration.cs
index 2594ea8a..22f2935c 100644
--- a/Vonage/Configuration.cs
+++ b/Vonage/Configuration.cs
@@ -70,10 +70,11 @@ public HttpClient Client
     {
         get
         {
-            var client = RequestsPerSecond
+            var handler = RequestsPerSecond
                 .Map(BuildSemaphore)
                 .Map(this.GetThrottlingMessageHandler)
-                .Match(some => new HttpClient(some), this.BuildDefaultClient);
+                .IfNone(this.ClientHandler);
+            var client = new HttpClient(handler);
             this.RequestTimeout.IfSome(value => client.Timeout = value);
             return client;
         }
@@ -82,7 +83,7 @@ public HttpClient Client
     /// <summary>
     ///     Exposes an HttpMessageHandler.
     /// </summary>
-    public HttpMessageHandler ClientHandler { get; set; }
+    public HttpMessageHandler ClientHandler { get; set; } = new HttpClientHandler();
 
     /// <summary>
     ///     Retrieves the unique instance (Singleton).
@@ -148,11 +149,6 @@ public Credentials BuildCredentials() =>
     /// <returns>The Configuration.</returns>
     public static Configuration FromConfiguration(IConfiguration configuration) => new Configuration(configuration);
 
-    private HttpClient BuildDefaultClient() =>
-        this.ClientHandler == null
-            ? new HttpClient()
-            : new HttpClient(this.ClientHandler);
-
     private static TimeSpanSemaphore BuildSemaphore(double requestsPerSecond)
     {
         var delay = 1 / requestsPerSecond;
@@ -160,7 +156,7 @@ private static TimeSpanSemaphore BuildSemaphore(double requestsPerSecond)
         return execTimeSpanSemaphore;
     }
 
-    private ThrottlingMessageHandler GetThrottlingMessageHandler(TimeSpanSemaphore semaphore) =>
+    private HttpMessageHandler GetThrottlingMessageHandler(TimeSpanSemaphore semaphore) =>
         this.ClientHandler != null
             ? new ThrottlingMessageHandler(semaphore, this.ClientHandler)
             : new ThrottlingMessageHandler(semaphore);
diff --git a/Vonage/VonageClient.cs b/Vonage/VonageClient.cs
index 6f06d6d6..394d9d91 100644
--- a/Vonage/VonageClient.cs
+++ b/Vonage/VonageClient.cs
@@ -140,9 +140,9 @@ private VonageHttpClientConfiguration BuildConfiguration(HttpClient client) =>
 
     private Configuration GetConfiguration() => this.configuration.IfNone(Configuration.Instance);
 
-    private HttpClient InitializeHttpClient(Uri baseUri)
+    private HttpClient InitializeHttpClient(HttpMessageHandler handler, Uri baseUri)
     {
-        var client = new HttpClient(new HttpClientHandler())
+        var client = new HttpClient(handler)
         {
             BaseAddress = baseUri,
         };
@@ -166,30 +166,20 @@ private void PropagateCredentials()
         this.SmsClient = new SmsClient(this.Credentials, this.GetConfiguration(), this.timeProvider);
         this.PricingClient = new PricingClient(this.Credentials, this.GetConfiguration(), this.timeProvider);
         this.MessagesClient = new MessagesClient(this.Credentials, this.GetConfiguration(), this.timeProvider);
-        this.VerifyV2Client =
-            new VerifyV2Client(
-                this.BuildConfiguration(this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Nexmo)));
-        this.SubAccountsClient = new SubAccountsClient(
-            this.BuildConfiguration(this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Nexmo)),
-            this.Credentials.ApiKey);
-        this.NumberInsightV2Client = new NumberInsightV2Client(
-            this.BuildConfiguration(this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Nexmo)));
-        this.UsersClient =
-            new UsersClient(
-                this.BuildConfiguration(this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Nexmo)));
-        this.ConversationsClient =
-            new ConversationsClient(
-                this.BuildConfiguration(this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Nexmo)));
-        this.MeetingsClient = new MeetingsClient(
-            this.BuildConfiguration(
-                this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Get(VonageUrls.Region.EU))),
-            new FileSystem());
-        this.ProactiveConnectClient =
-            new ProactiveConnectClient(
-                this.BuildConfiguration(
-                    this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Get(VonageUrls.Region.EU))));
-        this.VideoClient =
-            new VideoClient(
-                this.BuildConfiguration(this.InitializeHttpClient(this.GetConfiguration().VonageUrls.Video)));
+        var nexmoHttpClient = this.InitializeHttpClient(
+            this.GetConfiguration().ClientHandler ?? new HttpClientHandler(), this.GetConfiguration().VonageUrls.Nexmo);
+        var videoHttpClient = this.InitializeHttpClient(
+            this.GetConfiguration().ClientHandler ?? new HttpClientHandler(), this.GetConfiguration().VonageUrls.Video);
+        var euHttpClient = this.InitializeHttpClient(this.GetConfiguration().ClientHandler ?? new HttpClientHandler(),
+            this.GetConfiguration().VonageUrls.Get(VonageUrls.Region.EU));
+        this.VerifyV2Client = new VerifyV2Client(this.BuildConfiguration(nexmoHttpClient));
+        this.SubAccountsClient =
+            new SubAccountsClient(this.BuildConfiguration(nexmoHttpClient), this.Credentials.ApiKey);
+        this.NumberInsightV2Client = new NumberInsightV2Client(this.BuildConfiguration(nexmoHttpClient));
+        this.UsersClient = new UsersClient(this.BuildConfiguration(nexmoHttpClient));
+        this.ConversationsClient = new ConversationsClient(this.BuildConfiguration(nexmoHttpClient));
+        this.MeetingsClient = new MeetingsClient(this.BuildConfiguration(euHttpClient), new FileSystem());
+        this.ProactiveConnectClient = new ProactiveConnectClient(this.BuildConfiguration(euHttpClient));
+        this.VideoClient = new VideoClient(this.BuildConfiguration(videoHttpClient));
     }
 }
\ No newline at end of file