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diff --git a/src/DotNetOpenAuth.Core/Messaging/IHttpDirectResponseContract.cs b/src/DotNetOpenAuth.Core/Messaging/IHttpDirectResponseContract.cs
new file mode 100644
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+++ b/src/DotNetOpenAuth.Core/Messaging/IHttpDirectResponseContract.cs
@@ -0,0 +1,43 @@
+//-----------------------------------------------------------------------
+// <copyright file="IHttpDirectResponseContract.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.Messaging {
+	using System;
+	using System.Collections.Generic;
+	using System.Diagnostics.Contracts;
+	using System.Linq;
+	using System.Net;
+	using System.Text;
+
+	/// <summary>
+	/// Contract class for the <see cref="IHttpDirectResponse"/> interface.
+	/// </summary>
+	[ContractClassFor(typeof(IHttpDirectResponse))]
+	public abstract class IHttpDirectResponseContract : IHttpDirectResponse {
+		#region IHttpDirectResponse Members
+
+		/// <summary>
+		/// Gets the HTTP status code that the direct response should be sent with.
+		/// </summary>
+		/// <value></value>
+		HttpStatusCode IHttpDirectResponse.HttpStatusCode {
+			get { throw new NotImplementedException(); }
+		}
+
+		/// <summary>
+		/// Gets the HTTP headers to add to the response.
+		/// </summary>
+		/// <value>May be an empty collection, but must not be <c>null</c>.</value>
+		WebHeaderCollection IHttpDirectResponse.Headers {
+			get {
+				Contract.Ensures(Contract.Result<WebHeaderCollection>() != null);
+				throw new NotImplementedException();
+			}
+		}
+
+		#endregion
+	}
+}