diff --git a/RestSharp.IntegrationTests/AsyncRequestBodyTests.cs b/RestSharp.IntegrationTests/AsyncRequestBodyTests.cs
new file mode 100644
index 000000000..d0d654e4a
--- /dev/null
+++ b/RestSharp.IntegrationTests/AsyncRequestBodyTests.cs
@@ -0,0 +1,197 @@
+using System.IO;
+using System.Net;
+using System.Threading;
+using RestSharp.IntegrationTests.Helpers;
+using Xunit;
+
+namespace RestSharp.IntegrationTests
+{
+	public class AsyncRequestBodyTests
+	{
+		private const string BASE_URL = "http://localhost:8080/";
+
+		[Fact]
+		public void Can_Not_Be_Added_To_GET_Request()
+		{
+			const Method httpMethod = Method.GET;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasNoRequestBody();
+			}
+		}
+
+		[Fact]
+		public void Can_Be_Added_To_POST_Request()
+		{
+			const Method httpMethod = Method.POST;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasRequestBody(contentType, bodyData);
+			}
+		}
+
+		[Fact]
+		public void Can_Be_Added_To_PUT_Request()
+		{
+			const Method httpMethod = Method.PUT;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasRequestBody(contentType, bodyData);
+			}
+		}
+
+		[Fact]
+		public void Can_Be_Added_To_DELETE_Request()
+		{
+			const Method httpMethod = Method.DELETE;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasRequestBody(contentType, bodyData);
+			}
+		}
+
+		[Fact]
+		public void Can_Not_Be_Added_To_HEAD_Request()
+		{
+			const Method httpMethod = Method.HEAD;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasNoRequestBody();
+			}
+		}
+
+		[Fact]
+		public void Can_Be_Added_To_OPTIONS_Request()
+		{
+			const Method httpMethod = Method.OPTIONS;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasRequestBody(contentType, bodyData);
+			}
+		}
+
+		[Fact]
+		public void Can_Be_Added_To_PATCH_Request()
+		{
+			const Method httpMethod = Method.PATCH;
+			using (SimpleServer.Create(BASE_URL, Handlers.Generic<RequestBodyCapturer>()))
+			{
+				var client = new RestClient(BASE_URL);
+				var request = new RestRequest(RequestBodyCapturer.RESOURCE, httpMethod);
+
+				const string contentType = "text/plain";
+				const string bodyData = "abc123 foo bar baz BING!";
+				request.AddParameter(contentType, bodyData, ParameterType.RequestBody);
+
+				var resetEvent = new ManualResetEvent(false);
+				client.ExecuteAsync(request, response => resetEvent.Set());
+				resetEvent.WaitOne();
+
+				AssertHasRequestBody(contentType, bodyData);
+			}
+		}
+
+		private static void AssertHasNoRequestBody()
+		{
+			Assert.Null(RequestBodyCapturer.CapturedContentType);
+			Assert.Equal(false, RequestBodyCapturer.CapturedHasEntityBody);
+			Assert.Equal(string.Empty, RequestBodyCapturer.CapturedEntityBody);
+		}
+
+		private static void AssertHasRequestBody(string contentType, string bodyData)
+		{
+			Assert.Equal(contentType, RequestBodyCapturer.CapturedContentType);
+			Assert.Equal(true, RequestBodyCapturer.CapturedHasEntityBody);
+			Assert.Equal(bodyData, RequestBodyCapturer.CapturedEntityBody);
+		}
+
+		private class RequestBodyCapturer
+		{
+			public const string RESOURCE = "Capture";
+
+			public static string CapturedContentType { get; set; }
+			public static bool CapturedHasEntityBody { get; set; }
+			public static string CapturedEntityBody { get; set; }
+
+			public static void Capture(HttpListenerContext context)
+			{
+				var request = context.Request;
+				CapturedContentType = request.ContentType;
+				CapturedHasEntityBody = request.HasEntityBody;
+				CapturedEntityBody = StreamToString(request.InputStream);
+			}
+
+			private static string StreamToString(Stream stream)
+			{
+				var streamReader = new StreamReader(stream);
+				return streamReader.ReadToEnd();
+			}
+		}
+	}
+}
diff --git a/RestSharp.IntegrationTests/RestSharp.IntegrationTests.csproj b/RestSharp.IntegrationTests/RestSharp.IntegrationTests.csproj
index 5be3f9c41..46713a3a8 100644
--- a/RestSharp.IntegrationTests/RestSharp.IntegrationTests.csproj
+++ b/RestSharp.IntegrationTests/RestSharp.IntegrationTests.csproj
@@ -64,6 +64,7 @@
   <ItemGroup>
     <Compile Include="AsyncTests.cs" />
     <Compile Include="AuthenticationTests.cs" />
+    <Compile Include="AsyncRequestBodyTests.cs" />
     <Compile Include="NonProtocolExceptionHandlingTests.cs" />
     <Compile Include="Helpers\Extensions.cs" />
     <Compile Include="FileTests.cs" />
diff --git a/RestSharp/Http.Async.cs b/RestSharp/Http.Async.cs
index afa9108b8..e461d811b 100644
--- a/RestSharp/Http.Async.cs
+++ b/RestSharp/Http.Async.cs
@@ -104,9 +104,17 @@ private HttpWebRequest GetStyleMethodInternalAsync(string method, Action<HttpRes
 			{
 				var url = Url;
 				webRequest = ConfigureAsyncWebRequest(method, url);
-				_timeoutState = new TimeOutState { Request = webRequest };
-				var asyncResult = webRequest.BeginGetResponse(result => ResponseCallback(result, callback), webRequest);
-				SetTimeout(asyncResult, _timeoutState);
+                if (HasBody && (method == "DELETE" || method == "OPTIONS"))
+                {
+                    webRequest.ContentType = RequestContentType;
+                    WriteRequestBodyAsync(webRequest, callback);
+                }
+                else
+                {
+                    _timeoutState = new TimeOutState { Request = webRequest };
+                    var asyncResult = webRequest.BeginGetResponse(result => ResponseCallback(result, callback), webRequest);
+                    SetTimeout(asyncResult, _timeoutState);
+                }
 			}
 			catch(Exception ex)
 			{