diff --git a/src/Serilog.Sinks.Splunk/Sinks/Splunk/EventCollectorSink.cs b/src/Serilog.Sinks.Splunk/Sinks/Splunk/EventCollectorSink.cs
index 761f0fa..1e86e19 100644
--- a/src/Serilog.Sinks.Splunk/Sinks/Splunk/EventCollectorSink.cs
+++ b/src/Serilog.Sinks.Splunk/Sinks/Splunk/EventCollectorSink.cs
@@ -18,6 +18,7 @@
 using System.IO;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using System.Threading;
 using System.Threading.Tasks;
 using Serilog.Core;
@@ -73,7 +74,7 @@ public EventCollectorSink(
                 formatProvider,
                 renderTemplate)
         {
-        } 
+        }
 
         /// <summary>
         /// Creates a new instance of the sink
@@ -89,6 +90,7 @@ public EventCollectorSink(
         /// <param name="source">The source of the event</param>
         /// <param name="sourceType">The source type of the event</param>
         /// <param name="host">The host of the event</param>
+        /// <param name="messageHandler">The handler used to send HTTP requests</param>
         public EventCollectorSink(
             string splunkHost,
             string eventCollectorToken,
@@ -100,7 +102,8 @@ public EventCollectorSink(
             int batchIntervalInSeconds,
             int batchSizeLimit,
             IFormatProvider formatProvider = null,
-            bool renderTemplate = true)
+            bool renderTemplate = true,
+            HttpMessageHandler messageHandler = null)
         {
             _uriPath = uriPath;
             _splunkHost = splunkHost;
@@ -109,7 +112,9 @@ public EventCollectorSink(
             _batchSizeLimitLimit = batchSizeLimit;
 
             var batchInterval = TimeSpan.FromSeconds(batchIntervalInSeconds);
-            _httpClient = new EventCollectorClient(eventCollectorToken);
+            _httpClient = messageHandler != null
+                ? new EventCollectorClient(eventCollectorToken, messageHandler)
+                : new EventCollectorClient(eventCollectorToken);
 
             var cancellationToken = new CancellationToken();
 
diff --git a/src/Serilog.Sinks.Splunk/SplunkLoggingConfigurationExtensions.cs b/src/Serilog.Sinks.Splunk/SplunkLoggingConfigurationExtensions.cs
index 3db143b..b14dec1 100644
--- a/src/Serilog.Sinks.Splunk/SplunkLoggingConfigurationExtensions.cs
+++ b/src/Serilog.Sinks.Splunk/SplunkLoggingConfigurationExtensions.cs
@@ -51,6 +51,7 @@ public static class SplunkLoggingConfigurationExtensions
         /// <param name="renderTemplate">If ture, the message template will be rendered</param>
         /// <param name="batchIntervalInSeconds">The interval in seconds that the queue should be instpected for batching</param>
         /// <param name="batchSizeLimit">The size of the batch</param>
+        /// <param name="messageHandler">The handler used to send HTTP requests</param>
         /// <returns></returns>
         public static LoggerConfiguration EventCollector(
             this LoggerSinkConfiguration configuration,
@@ -66,7 +67,8 @@ public static LoggerConfiguration EventCollector(
             IFormatProvider formatProvider = null,
             bool renderTemplate = true,
             int batchIntervalInSeconds = 2,
-            int batchSizeLimit = 100)
+            int batchSizeLimit = 100,
+            HttpMessageHandler messageHandler = null)
         {
             if (configuration == null) throw new ArgumentNullException(nameof(configuration));
             if (outputTemplate == null) throw new ArgumentNullException(nameof(outputTemplate));
@@ -82,7 +84,8 @@ public static LoggerConfiguration EventCollector(
                 batchIntervalInSeconds,
                 batchSizeLimit,
                 formatProvider,
-                renderTemplate);
+                renderTemplate,
+                messageHandler);
 
             return configuration.Sink(eventCollectorSink, restrictedToMinimumLevel);
         }