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diff --git a/src/DotNetOpenAuth.Core/Messaging/IHttpDirectRequestContract.cs b/src/DotNetOpenAuth.Core/Messaging/IHttpDirectRequestContract.cs
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+++ b/src/DotNetOpenAuth.Core/Messaging/IHttpDirectRequestContract.cs
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+//-----------------------------------------------------------------------
+// <copyright file="IHttpDirectRequestContract.cs" company="Outercurve Foundation">
+//     Copyright (c) Outercurve Foundation. 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="IHttpDirectRequest"/> interface.
+	/// </summary>
+	[ContractClassFor(typeof(IHttpDirectRequest))]
+	public abstract class IHttpDirectRequestContract : IHttpDirectRequest {
+		#region IHttpDirectRequest Members
+
+		/// <summary>
+		/// Gets the HTTP headers of the request.
+		/// </summary>
+		/// <value>May be an empty collection, but must not be <c>null</c>.</value>
+		WebHeaderCollection IHttpDirectRequest.Headers {
+			get {
+				Contract.Ensures(Contract.Result<WebHeaderCollection>() != null);
+				throw new NotImplementedException();
+			}
+		}
+
+		#endregion
+
+		#region IMessage Members
+
+		/// <summary>
+		/// Gets the version of the protocol or extension this message is prepared to implement.
+		/// </summary>
+		/// <remarks>
+		/// Implementations of this interface should ensure that this property never returns null.
+		/// </remarks>
+		Version IMessage.Version {
+			get { throw new NotImplementedException(); }
+		}
+
+		/// <summary>
+		/// Gets the extra, non-standard Protocol parameters included in the message.
+		/// </summary>
+		/// <remarks>
+		/// Implementations of this interface should ensure that this property never returns null.
+		/// </remarks>
+		IDictionary<string, string> IMessage.ExtraData {
+			get { throw new NotImplementedException(); }
+		}
+
+		/// <summary>
+		/// Checks the message state for conformity to the protocol specification
+		/// and throws an exception if the message is invalid.
+		/// </summary>
+		/// <remarks>
+		/// <para>Some messages have required fields, or combinations of fields that must relate to each other
+		/// in specialized ways.  After deserializing a message, this method checks the state of the 
+		/// message to see if it conforms to the protocol.</para>
+		/// <para>Note that this property should <i>not</i> check signatures or perform any state checks
+		/// outside this scope of this particular message.</para>
+		/// </remarks>
+		/// <exception cref="ProtocolException">Thrown if the message is invalid.</exception>
+		void IMessage.EnsureValidMessage() {
+			throw new NotImplementedException();
+		}
+
+		#endregion
+	}
+}