adding OSHttpRequest and OSHttpResponse which wrap HttpListenerRequest and HttpListenerResponse respectively.

enhancing IStreamHandler and IStreamedHandler interfaces so that OSHttp{Request,Response} get passed in, 
allowing RestHandlers to set response status code, redirections, etc.

OpenSim/Framework/Servers/OSHttpRequest.cs

@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSim Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Specialized;
+using System.Net;
+using System.IO;
+using System.Text;
+
+namespace OpenSim.Framework.Servers
+{
+    public class OSHttpRequest
+    {
+        private string[] _acceptTypes;
+        private Encoding _contentEncoding;
+        private long _contentLength64;
+        private string _contentType;
+        private CookieCollection _cookies;
+        private NameValueCollection _headers;
+        private string _httpMethod;
+        private Stream _inputStream;
+        private bool _isSecureConnection;
+        private bool _keepAlive;
+        private string _rawUrl;
+        private Uri _url;
+        private NameValueCollection _queryString;
+        private string _userAgent;
+
+        public string[] AcceptTypes
+        {
+            get { return _acceptTypes; }
+        }
+
+        public Encoding ContentEncoding 
+        {
+            get { return _contentEncoding; }
+        }
+
+        public long ContentLength
+        {
+            get { return _contentLength64; }
+        }
+
+        public string ContentType
+        {
+            get { return _contentType; }
+        }
+
+        public CookieCollection Cookies
+        {
+            get { return _cookies; }
+        }
+
+        public NameValueCollection Headers
+        {
+            get { return _headers; }
+        }
+
+        public string HttpMethod
+        {
+            get { return _httpMethod; }
+        }
+
+        public Stream InputStream
+        {
+            get { return _inputStream; }
+        }
+
+        public bool IsSecureConnection
+        {
+            get { return _isSecureConnection; }
+        }
+
+        public bool KeepAlive
+        {
+            get { return _keepAlive; }
+        }
+
+        public string RawUrl
+        {
+            get { return _rawUrl; }
+        }
+
+        public Uri Url
+        {
+            get { return _url; }
+        }
+
+        public string UserAgent 
+        {
+            get { return _userAgent; }
+        }
+
+        public NameValueCollection QueryString
+        {
+            get { return _queryString; }
+        }
+
+        public OSHttpRequest()
+        {
+        }
+
+        public OSHttpRequest(HttpListenerRequest req)
+        {
+            _acceptTypes = req.AcceptTypes;
+            _contentEncoding = req.ContentEncoding;
+            _contentLength64 = req.ContentLength64;
+            _contentType = req.ContentType;
+            _cookies = req.Cookies;
+            _headers = req.Headers;
+            _httpMethod = req.HttpMethod;
+            _inputStream = req.InputStream;
+            _isSecureConnection = req.IsSecureConnection;
+            _keepAlive = req.KeepAlive;
+            _rawUrl = req.RawUrl;
+            _url = req.Url;
+            _queryString = req.QueryString;
+            _userAgent = req.UserAgent;
+        }
+    }
+}