Merge pull request #901 from Blewzman/FixAggregateExceptionGetBaseException
[mono.git] / mcs / class / System.Web / System.Web / HttpResponse.cs
index 4ae2f77711d9ed4e8df57fa60544552fdbff03c2..053d20c9c58b9baa0a741ee35ea327dbf1a9ae48 100644 (file)
@@ -5,8 +5,9 @@
 // Author:
 //     Miguel de Icaza (miguel@novell.com)
 //     Gonzalo Paniagua Javier (gonzalo@ximian.com)
+//      Marek Habersack <mhabersack@novell.com>
 //
-// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
+// Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
 //
 // Permission is hereby granted, free of charge, to any person obtaining
 // a copy of this software and associated documentation files (the
@@ -42,11 +43,16 @@ using System.Security.Permissions;
 using System.Web.Hosting;
 using System.Web.SessionState;
 
-namespace System.Web {
-       
+#if NET_4_0
+using System.Web.Routing;
+#endif
+
+namespace System.Web
+{      
        // CAS - no InheritanceDemand here as the class is sealed
        [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
-       public sealed partial class HttpResponse {
+       public sealed partial class HttpResponse
+       {
                internal HttpWorkerRequest WorkerRequest;
                internal HttpResponseStream output_stream;
                internal bool buffer = true;
@@ -68,8 +74,8 @@ namespace System.Web {
                CachedRawResponse cached_response;
                string user_cache_control = "private";
                string redirect_location;
-               
-               static UnknownResponseHeader version_header;
+               string version_header;
+               bool version_header_checked;
                
                //
                // Negative Content-Length means we auto-compute the size of content-length
@@ -81,9 +87,10 @@ namespace System.Web {
                // The list of the headers that we will send back to the client, except
                // the headers that we compute here.
                //
-               ArrayList headers = new ArrayList ();
+
+               HttpHeaderCollection headers;
                bool headers_sent;
-               ArrayList cached_headers;
+               NameValueCollection cached_headers;
 
                //
                // Transfer encoding state
@@ -92,38 +99,25 @@ namespace System.Web {
                internal bool use_chunked;
                
                bool closed;
+               bool completed;
                internal bool suppress_content;
 
                //
                // Session State
                //
                string app_path_mod;
-               
-#if NET_2_0
                bool is_request_being_redirected;
                Encoding headerEncoding;
-#endif
 
-               static HttpResponse ()
-               {
-#if NET_2_0
-                       HttpRuntimeSection config = WebConfigurationManager.GetWebApplicationSection ("system.web/httpRuntime") as HttpRuntimeSection;
-#else
-                       HttpRuntimeConfig config = HttpContext.GetAppConfig ("system.web/httpRuntime") as HttpRuntimeConfig;
-#endif
-                       if (config != null && config.EnableVersionHeader) {
-                               string version = Environment.Version.ToString (3);
-                               version_header = new UnknownResponseHeader ("X-AspNet-Version", version);
-                       }
-               }
-               
                internal HttpResponse ()
                {
                        output_stream = new HttpResponseStream (this);
+                       writer = new HttpWriter (this);
                }
 
                public HttpResponse (TextWriter writer) : this ()
                {
+
                        this.writer = writer;
                }
 
@@ -133,11 +127,17 @@ namespace System.Web {
                        this.context = context;
 
 #if !TARGET_J2EE
-                       if (worker_request != null)
-                               use_chunked = (worker_request.GetHttpVersion () == "HTTP/1.1");
+                       if (worker_request != null && worker_request.GetHttpVersion () == "HTTP/1.1") {
+                               string gi = worker_request.GetServerVariable ("GATEWAY_INTERFACE");
+                               use_chunked = (String.IsNullOrEmpty (gi) ||
+                                       !gi.StartsWith ("cgi", StringComparison.OrdinalIgnoreCase));
+                       } else {
+                               use_chunked = false;
+                       }
 #endif
+                       writer = new HttpWriter (this);
                }
-               
+
                internal TextWriter SetTextWriter (TextWriter writer)
                {
                        TextWriter prev = this.writer;
@@ -145,6 +145,24 @@ namespace System.Web {
                        return prev;
                }
 
+               internal string VersionHeader {
+                       get {
+                               if (!version_header_checked && version_header == null) {
+                                       version_header_checked = true;
+                                       HttpRuntimeSection config = HttpRuntime.Section;
+                                       if (config != null && config.EnableVersionHeader)
+                                               version_header = Environment.Version.ToString (3);
+                               }
+
+                               return version_header;
+                       }
+               }
+
+               internal HttpContext Context {
+                       get { return context; }
+                       set { context = value; }
+               }
+                       
                internal string[] FileDependencies {
                        get {
                                if (fileDependencies == null || fileDependencies.Count == 0)
@@ -282,7 +300,7 @@ namespace System.Web {
                                output_stream.Filter = value;
                        }
                }
-#if NET_2_0
+
                public Encoding HeaderEncoding {
                        get {
                                if (headerEncoding == null) {
@@ -309,14 +327,16 @@ namespace System.Web {
                        }
                }
 
-               [MonoTODO ("Not implemented")]
                public NameValueCollection Headers {
                        get {
-                               // TODO: currently only return empty NameValueColletion
-                               return new NameValueCollection ();
+                               if (headers == null)
+                                       headers = new HttpHeaderCollection ();
+
+                               return headers;
                        }
                }
-#endif
+
+               
                public bool IsClientConnected {
                        get {
                                if (WorkerRequest == null)
@@ -325,18 +345,18 @@ namespace System.Web {
                                return WorkerRequest.IsClientConnected ();
                        }
                }
-#if NET_2_0
+
                public bool IsRequestBeingRedirected {
                        get { return is_request_being_redirected; }
                }
-#endif
+
                public TextWriter Output {
                        get {
-                               if (writer == null)
-                                       writer = new HttpWriter (this);
-
                                return writer;
                        }
+#if NET_4_0
+                       set { writer = value; }
+#endif
                }
 
                public Stream OutputStream {
@@ -365,22 +385,26 @@ namespace System.Web {
 
                                string s = value.Substring (0, p);
                                
-#if NET_2_0
                                if (!Int32.TryParse (s, out status_code))
                                        throw new HttpException ("Invalid format for the Status property");
-#else
-                                                   
-                               try {
-                                       status_code = Int32.Parse (s);
-                               } catch {
-                                       throw new HttpException ("Invalid format for the Status property");
-                               }
-#endif
                                
                                status_description = value.Substring (p+1);
                        }
                }
 
+               // We ignore the two properties on Mono as they are for use with IIS7, but there is
+               // no point in throwing PlatformNotSupportedException. We might find a use for them
+               // some day.
+               public int SubStatusCode {
+                       get;
+                       set;
+               }
+
+               public bool TrySkipIisCustomErrors {
+                       get;
+                       set;
+               }
+               
                public int StatusCode {
                        get {
                                return status_code;
@@ -421,7 +445,6 @@ namespace System.Web {
                        }
                }
 
-#if NET_2_0
                [MonoTODO ("Not implemented")]
                public void AddCacheDependency (CacheDependency[] dependencies)
                {
@@ -433,7 +456,7 @@ namespace System.Web {
                {
                        throw new NotImplementedException ();
                }
-#endif
+
                [MonoTODO("Currently does nothing")]
                public void AddCacheItemDependencies (ArrayList cacheKeys)
                {
@@ -452,14 +475,13 @@ namespace System.Web {
                                return;
                        FileDependenciesArray.AddRange (filenames);
                }
-#if NET_2_0
+
                public void AddFileDependencies (string[] filenames)
                {
                        if (filenames == null || filenames.Length == 0)
                                return;
                        FileDependenciesArray.AddRange (filenames);
                }
-#endif         
 
                public void AddFileDependency (string filename)
                {
@@ -486,35 +508,34 @@ namespace System.Web {
                public void AppendHeader (string name, string value)
                {
                        if (headers_sent)
-                               throw new HttpException ("headers have been already sent");
-                       
+                               throw new HttpException ("Headers have been already sent");
 #if !TARGET_J2EE
-                       if (String.Compare (name, "content-length", true, CultureInfo.InvariantCulture) == 0){
+                       if (String.Compare (name, "content-length", StringComparison.OrdinalIgnoreCase) == 0){
                                content_length = (long) UInt64.Parse (value);
                                use_chunked = false;
                                return;
                        }
 #endif
 
-                       if (String.Compare (name, "content-type", true, CultureInfo.InvariantCulture) == 0){
+                       if (String.Compare (name, "content-type", StringComparison.OrdinalIgnoreCase) == 0){
                                ContentType = value;
                                return;
                        }
 
 #if !TARGET_J2EE
-                       if (String.Compare (name, "transfer-encoding", true, CultureInfo.InvariantCulture) == 0){
+                       if (String.Compare (name, "transfer-encoding", StringComparison.OrdinalIgnoreCase) == 0){
                                transfer_encoding = value;
                                use_chunked = false;
                                return;
                        }
 #endif
 
-                       if (String.Compare (name, "cache-control", true, CultureInfo.InvariantCulture) == 0){
+                       if (String.Compare (name, "cache-control", StringComparison.OrdinalIgnoreCase) == 0){
                                user_cache_control = value;
                                return;
                        }
 
-                       headers.Add (new UnknownResponseHeader (name, value));
+                       Headers.Add (name, value);
                }
 
                [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
@@ -526,10 +547,10 @@ namespace System.Web {
                
                public string ApplyAppPathModifier (string virtualPath)
                {
-                       if (virtualPath == null)
+                       if (virtualPath == null || context == null)
                                return null;
                
-                       if (virtualPath == "")
+                       if (virtualPath.Length == 0)
                                return context.Request.RootVirtualDir;
 
                        if (UrlUtils.IsRelativeUrl (virtualPath)) {
@@ -539,13 +560,9 @@ namespace System.Web {
                        }
 
                        bool cookieless = false;
-#if NET_2_0
                        SessionStateSection config = WebConfigurationManager.GetWebApplicationSection ("system.web/sessionState") as SessionStateSection;
                        cookieless = SessionStateModule.IsCookieLess (context, config);
-#else
-                       SessionConfig config = HttpContext.GetAppConfig ("system.web/sessionState") as SessionConfig;
-                       cookieless = config.CookieLess;
-#endif
+
                        if (!cookieless)
                                return virtualPath;
 
@@ -588,8 +605,12 @@ namespace System.Web {
                        content_length = -1;
                        content_type = "text/html";
                        transfer_encoding = null;
-                       user_cache_control = null;
-                       headers.Clear ();
+                       user_cache_control = "private";
+                       if (cache_policy != null)
+                               cache_policy.Cacheability = HttpCacheability.Private;
+
+                       if (headers != null)
+                               headers.Clear ();
                }
 
                internal bool HeadersSent {
@@ -607,12 +628,10 @@ namespace System.Web {
                        closed = true;
                }
 
-#if NET_2_0
                public void DisableKernelCache ()
                {
                        // does nothing in Mono
                }
-#endif
                
                public void End ()
                {
@@ -636,30 +655,31 @@ namespace System.Web {
                //   Transfer-Encoding (chunked)
                //   Cache-Control
                //   X-AspNet-Version
-               void AddHeadersNoCache (ArrayList write_headers, bool final_flush)
+               void AddHeadersNoCache (NameValueCollection write_headers, bool final_flush)
                {
 #if !TARGET_J2EE
                        //
                        // Transfer-Encoding
                        //
                        if (use_chunked)
-                               write_headers.Add (new UnknownResponseHeader ("Transfer-Encoding", "chunked"));
+                               write_headers.Add ("Transfer-Encoding", "chunked");
                        else if (transfer_encoding != null)
-                               write_headers.Add (new UnknownResponseHeader ("Transfer-Encoding", transfer_encoding));
+                               write_headers.Add ("Transfer-Encoding", transfer_encoding);
 #endif
                        if (redirect_location != null)
-                               write_headers.Add (new UnknownResponseHeader ("Location", redirect_location));
+                               write_headers.Add ("Location", redirect_location);
                        
 #if !TARGET_J2EE
-                       if (version_header != null)
-                               write_headers.Add (version_header);
+                       string vh = VersionHeader;
+                       if (vh != null)
+                               write_headers.Add ("X-AspNet-Version", vh);
 
                        //
                        // If Content-Length is set.
                        //
                        if (content_length >= 0) {
-                               write_headers.Add (new KnownResponseHeader (HttpWorkerRequest.HeaderContentLength,
-                                                                     content_length.ToString (CultureInfo.InvariantCulture)));
+                               write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderContentLength),
+                                                  content_length.ToString (Helpers.InvariantCulture));
                        } else if (BufferOutput) {
                                if (final_flush) {                                      
                                        //
@@ -667,15 +687,15 @@ namespace System.Web {
                                        // we know the content-length.
                                        //
                                        content_length = output_stream.total;
-                                       write_headers.Add (new KnownResponseHeader (HttpWorkerRequest.HeaderContentLength,
-                                                                             content_length.ToString (CultureInfo.InvariantCulture)));
+                                       write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderContentLength),
+                                                          content_length.ToString (Helpers.InvariantCulture));
                                } else {
                                        //
                                        // We are buffering, and this is a flush in the middle.
                                        // If we are not chunked, we need to set "Connection: close".
                                        //
                                        if (use_chunked){
-                                               write_headers.Add (new KnownResponseHeader (HttpWorkerRequest.HeaderConnection, "close"));
+                                               write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderConnection), "close");
                                        }
                                }
                        } else {
@@ -684,7 +704,7 @@ namespace System.Web {
                                // close at the end.
                                //
                                if (use_chunked){
-                                       write_headers.Add (new KnownResponseHeader (HttpWorkerRequest.HeaderConnection, "close"));
+                                       write_headers.Add (HttpWorkerRequest.GetKnownResponseHeaderName (HttpWorkerRequest.HeaderConnection), "close");
                                }
                        }
 #endif
@@ -695,7 +715,7 @@ namespace System.Web {
                        if (cache_policy != null)
                                cache_policy.SetHeaders (this, headers);
                        else
-                               write_headers.Add (new UnknownResponseHeader ("Cache-Control", CacheControl));
+                               write_headers.Add ("Cache-Control", CacheControl);
                        
                        //
                        // Content-Type
@@ -711,13 +731,13 @@ namespace System.Web {
                                        }
                                }
                                
-                               write_headers.Add (new UnknownResponseHeader ("Content-Type", header));
+                               write_headers.Add ("Content-Type", header);
                        }
 
                        if (cookies != null && cookies.Count != 0){
                                int n = cookies.Count;
                                for (int i = 0; i < n; i++)
-                                       write_headers.Add (cookies.Get (i).GetCookieHeader ());
+                                       write_headers.Add ("Set-Cookie", cookies.Get (i).GetCookieHeaderValue ());
 #if TARGET_J2EE
                                // For J2EE Portal support emulate cookies by storing them in the session.
                                context.Request.SetSessionCookiesForPortal (cookies);
@@ -746,18 +766,35 @@ namespace System.Web {
 
                        // If this page is cached use the cached headers
                        // instead of the standard headers      
-                       ArrayList write_headers = headers;
+                       NameValueCollection write_headers;
                        if (cached_headers != null)
                                write_headers = cached_headers;
-                       else
+                       else {
+                               write_headers = Headers;
                                AddHeadersNoCache (write_headers, final_flush);
-
+                       }
+                       
                        if (WorkerRequest != null)
                                WorkerRequest.SendStatus (status_code, StatusDescription);
 
                        if (WorkerRequest != null) {
-                               foreach (BaseResponseHeader header in write_headers){
-                                       header.SendContent (WorkerRequest);
+                               string header_name;
+                               string[] values;
+                               int header_index;
+                               
+                               for (int i = 0; i < write_headers.Count; i++) {
+                                       header_name = write_headers.GetKey (i);
+                                       header_index = HttpWorkerRequest.GetKnownResponseHeaderIndex (header_name);
+                                       values = write_headers.GetValues (i);
+                                       if (values == null)
+                                               continue;
+                                       
+                                       foreach (string val in values) {
+                                               if (header_index > -1)
+                                                       WorkerRequest.SendKnownResponseHeader (header_index, val);
+                                               else
+                                                       WorkerRequest.SendUnknownResponseHeader (header_name, val);
+                                       }
                                }
                        }
                }
@@ -770,6 +807,9 @@ namespace System.Web {
 
                internal void Flush (bool final_flush)
                {
+                       if (completed)
+                               throw new HttpException ("Server cannot flush a completed response");
+                       
                        DoFilter (final_flush);
                        if (!headers_sent){
                                if (final_flush || status_code != 200)
@@ -783,9 +823,11 @@ namespace System.Web {
                                output_stream.Clear ();
                                if (WorkerRequest != null)
                                        output_stream.Flush (WorkerRequest, true); // ignore final_flush here.
+                               completed = true;
                                return;
                        }
-
+                       completed = final_flush;
+                       
                        if (!headers_sent)
                                WriteHeaders (final_flush);
 
@@ -795,11 +837,8 @@ namespace System.Web {
                                        app_instance.TriggerPreSendRequestContent ();
                        }
 
-                       if (IsCached) {
-                               MemoryStream ms = output_stream.GetData ();
-                               cached_response.ContentLength = (int) ms.Length;
-                               cached_response.SetData (ms.GetBuffer ());
-                       }
+                       if (IsCached)
+                               cached_response.SetData (output_stream.GetData ());
 
                        if (WorkerRequest != null)
                                output_stream.Flush (WorkerRequest, final_flush);
@@ -815,24 +854,52 @@ namespace System.Web {
                        AppendHeader ("PICS-Label", value);
                }
 
-               public void Redirect (string url)
-               {
-                       Redirect (url, true);
-               }
-
-               public void Redirect (string url, bool endResponse)
+               void Redirect (string url, bool endResponse, int code)
                {
+                       if (url == null)
+                               throw new ArgumentNullException ("url");
+                       
                        if (headers_sent)
                                throw new HttpException ("Headers have already been sent");
 
-#if NET_2_0
+                       if (url.IndexOf ('\n') != -1)
+                               throw new ArgumentException ("Redirect URI cannot contain newline characters.", "url");
+                       
                        is_request_being_redirected = true;
-#endif
                        ClearHeaders ();
                        ClearContent ();
                        
-                       StatusCode = 302;
+                       StatusCode = code;
                        url = ApplyAppPathModifier (url);
+
+                       bool isFullyQualified;
+                       if (StrUtils.StartsWith (url, "http:", true) ||
+                           StrUtils.StartsWith (url, "https:", true) ||
+                           StrUtils.StartsWith (url, "file:", true) ||
+                           StrUtils.StartsWith (url, "ftp:", true))
+                               isFullyQualified = true;
+                       else
+                               isFullyQualified = false;
+
+                       if (!isFullyQualified) {
+                               HttpRuntimeSection config = HttpRuntime.Section;
+                               if (config != null && config.UseFullyQualifiedRedirectUrl) {
+                                       var ub = new UriBuilder (context.Request.Url);
+                                       int qpos = url.IndexOf ('?');
+                                       if (qpos == -1) {
+                                               ub.Path = url;
+                                               ub.Query = null;
+                                       } else {
+                                               ub.Path = url.Substring (0, qpos);
+                                               ub.Query = url.Substring (qpos + 1);
+                                       }
+                                       ub.Fragment = null;
+                                       ub.Password = null;
+                                       ub.UserName = null;
+                                       url = ub.Uri.ToString ();
+                               }
+                       }
+                       
                        redirect_location = url;
 
                        // Text for browsers that can't handle location header
@@ -842,11 +909,107 @@ namespace System.Web {
                        
                        if (endResponse)
                                End ();
-#if NET_2_0
                        is_request_being_redirected = false;
-#endif
                }
+               
+               public void Redirect (string url)
+               {
+                       Redirect (url, true);
+               }
+
+               public void Redirect (string url, bool endResponse)
+               {
+                       Redirect (url, endResponse, 302);
+               }
+#if NET_4_0
+               public void RedirectPermanent (string url)
+               {
+                       RedirectPermanent (url, true);
+               }
+
+               public void RedirectPermanent (string url, bool endResponse)
+               {
+                       Redirect (url, endResponse, 301);
+               }
+
+               public void RedirectToRoute (object routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoute", null, new RouteValueDictionary (routeValues), 302, true);
+               }
+
+               public void RedirectToRoute (RouteValueDictionary routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoute", null, routeValues, 302, true);
+               }
+
+               public void RedirectToRoute (string routeName)
+               {
+                       RedirectToRoute ("RedirectToRoute", routeName, null, 302, true);
+               }
+
+               public void RedirectToRoute (string routeName, object routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoute", routeName, new RouteValueDictionary (routeValues), 302, true);
+               }
+
+               public void RedirectToRoute (string routeName, RouteValueDictionary routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoute", routeName, routeValues, 302, true);
+               }
+
+               public void RedirectToRoutePermanent (object routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoutePermanent", null, new RouteValueDictionary (routeValues), 301, false);
+               }
+
+               public void RedirectToRoutePermanent (RouteValueDictionary routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoutePermanent", null, routeValues, 301, false);
+               }
+
+               public void RedirectToRoutePermanent (string routeName)
+               {
+                       RedirectToRoute ("RedirectToRoutePermanent", routeName, null, 301, false);
+               }
+
+               public void RedirectToRoutePermanent (string routeName, object routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoutePermanent", routeName, new RouteValueDictionary (routeValues), 301, false);
+               }               
+
+               public void RedirectToRoutePermanent (string routeName, RouteValueDictionary routeValues)
+               {
+                       RedirectToRoute ("RedirectToRoutePermanent", routeName, routeValues, 301, false);
+               }
+               
+               void RedirectToRoute (string callerName, string routeName, RouteValueDictionary routeValues, int redirectCode, bool endResponse)
+               {
+                       HttpContext ctx = context ?? HttpContext.Current;
+                       HttpRequest req = ctx != null ? ctx.Request : null;
+                       
+                       if (req == null)
+                               // Let's emulate .NET
+                               throw new NullReferenceException ();
+                       
+                       VirtualPathData vpd = RouteTable.Routes.GetVirtualPath (req.RequestContext, routeName, routeValues);
+                       string redirectUrl = vpd != null ? vpd.VirtualPath : null;
+                       if (String.IsNullOrEmpty (redirectUrl))
+                               throw new InvalidOperationException ("No matching route found for RedirectToRoute");
 
+                       Redirect (redirectUrl, true, redirectCode);
+               }
+
+               public static void RemoveOutputCacheItem (string path, string providerName)
+               {
+                       if (path == null)
+                               throw new ArgumentNullException ("path");
+
+                       if (path.Length > 0 && path [0] != '/')
+                               throw new ArgumentException ("Invalid path for HttpResponse.RemoveOutputCacheItem: '" + path + "'. An absolute virtual path is expected");
+
+                       OutputCache.RemoveFromProvider (path, providerName);
+               }
+#endif
                public static void RemoveOutputCacheItem (string path)
                {
                        if (path == null)
@@ -858,7 +1021,19 @@ namespace System.Web {
                        if (path [0] != '/')
                                throw new ArgumentException ("'" + path + "' is not an absolute virtual path.");
 
-                       HttpRuntime.InternalCache.Remove (path);
+#if NET_4_0
+                       RemoveOutputCacheItem (path, OutputCache.DefaultProviderName);
+#else
+                       HttpContext context = HttpContext.Current;
+                       HttpApplication app_instance = context != null ? context.ApplicationInstance : null;
+                       HttpModuleCollection modules = app_instance != null ? app_instance.Modules : null;
+                       OutputCacheModule ocm = modules != null ? modules.Get ("OutputCache") as OutputCacheModule : null;
+                       OutputCacheProvider internalProvider = ocm != null ? ocm.InternalProvider : null;
+                       if (internalProvider == null)
+                               return;
+
+                       internalProvider.Remove (path);
+#endif
                }
 
                public void SetCookie (HttpCookie cookie)
@@ -868,27 +1043,82 @@ namespace System.Web {
 
                public void Write (char ch)
                {
-                       Output.Write (ch);
+                       TextWriter writer = Output;
+#if NET_4_0
+                       // Emulating .NET
+                       if (writer == null)
+                               throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
+#endif
+                       writer.Write (ch);
                }
 
                public void Write (object obj)
                {
+                       TextWriter writer = Output;
+#if NET_4_0
+                       // Emulating .NET
+                       if (writer == null)
+                               throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
+#endif
                        if (obj == null)
                                return;
                        
-                       Output.Write (obj.ToString ());
+                       writer.Write (obj.ToString ());
                }
                
                public void Write (string s)
                {
-                       Output.Write (s);
+                       TextWriter writer = Output;
+#if NET_4_0
+                       // Emulating .NET
+                       if (writer == null)
+                               throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
+#endif
+                       writer.Write (s);
                }
                
                public void Write (char [] buffer, int index, int count)
                {
-                       Output.Write (buffer, index, count);
+                       TextWriter writer = Output;
+#if NET_4_0
+                       // Emulating .NET
+                       if (writer == null)
+                               throw new NullReferenceException (".NET 4.0 emulation. A null value was found where an object was required.");
+#endif
+                       writer.Write (buffer, index, count);
                }
 
+               bool IsFileSystemDirSeparator (char ch)
+               {
+                       return ch == '\\' || ch == '/';
+               }
+               
+               string GetNormalizedFileName (string fn)
+               {
+                       if (String.IsNullOrEmpty (fn))
+                               return fn;
+
+                       // On Linux we don't change \ to / since filenames with \ are valid. We also
+                       // don't remove drive: designator for the same reason.
+                       int len = fn.Length;
+                       if (len >= 3 && fn [1] == ':' && IsFileSystemDirSeparator (fn [2]))
+                               return Path.GetFullPath (fn); // drive-qualified absolute file path
+
+                       bool startsWithDirSeparator = IsFileSystemDirSeparator (fn [0]);
+                       if (len >= 2 && startsWithDirSeparator && IsFileSystemDirSeparator (fn [1]))
+                               return Path.GetFullPath (fn); // UNC path
+
+                       if (!startsWithDirSeparator) {
+                               HttpContext ctx = context ?? HttpContext.Current;
+                               HttpRequest req = ctx != null ? ctx.Request : null;
+                               
+                               if (req != null)
+                                       return req.MapPath (fn);
+                       }
+                       
+                       return fn; // Or should we rather throw?
+               }
+               
                internal void WriteFile (FileStream fs, long offset, long size)
                {
                        byte [] buffer = new byte [32*1024];
@@ -914,12 +1144,13 @@ namespace System.Web {
                        if (filename == null)
                                throw new ArgumentNullException ("filename");
 
+                       string fn = GetNormalizedFileName (filename);
                        if (readIntoMemory){
-                               using (FileStream fs = File.OpenRead (filename))
+                               using (FileStream fs = File.OpenRead (fn))
                                        WriteFile (fs, 0, fs.Length);
                        } else {
-                               FileInfo fi = new FileInfo (filename);
-                               output_stream.WriteFile (filename, 0, fi.Length);
+                               FileInfo fi = new FileInfo (fn);
+                               output_stream.WriteFile (fn, 0, fi.Length);
                        }
                        if (buffer)
                                return;
@@ -976,13 +1207,35 @@ namespace System.Web {
                        output_stream.ApplyFilter (false);
                        Flush ();
                }
-#if NET_2_0
-               [MonoTODO ("Not implemented")]
+
                public void WriteSubstitution (HttpResponseSubstitutionCallback callback)
                {
-                       throw new NotImplementedException ();
+                       // Emulation of .NET behavior
+                       if (callback == null)
+                               throw new NullReferenceException ();
+
+                       object target = callback.Target;
+                       if (target != null && target.GetType () == typeof (Control))
+                               throw new ArgumentException ("callback");
+
+                       string s = callback (context);
+                       if (!IsCached) {
+                               Write (s);
+                               return;
+                       }
+
+                       Cache.Cacheability = HttpCacheability.Server;
+                       Flush ();
+                       if (WorkerRequest == null)
+                               Write (s); // better this than nothing
+                       else {
+                               byte[] bytes = WebEncoding.ResponseEncoding.GetBytes (s);
+                               WorkerRequest.SendResponseFromMemory (bytes, bytes.Length);
+                       }
+                       
+                       cached_response.SetData (callback);
                }
-#endif
+
                //
                // Like WriteFile, but never buffers, so we manually Flush here
                //
@@ -1003,7 +1256,6 @@ namespace System.Web {
                        Flush (final_flush);
                }
 
-#if NET_2_0
                public void TransmitFile (string filename, long offset, long length)
                {
                        output_stream.WriteFile (filename, offset, length);
@@ -1039,7 +1291,6 @@ namespace System.Web {
                                        Flush (true);
                        }
                }
-#endif
                
 #region Session state support
                internal void SetAppPathModifier (string app_modifier)
@@ -1049,9 +1300,10 @@ namespace System.Web {
 #endregion
                
 #region Cache Support
-               internal void SetCachedHeaders (ArrayList headers)
+               internal void SetCachedHeaders (NameValueCollection headers)
                {
                        cached_headers = headers;
+                       
                }
 
                internal bool IsCached {
@@ -1092,13 +1344,13 @@ namespace System.Web {
                                if (value == null || value == "") {
                                        Cache.SetCacheability (HttpCacheability.NoCache);
                                        user_cache_control = null;
-                               } else if (String.Compare (value, "public", true, CultureInfo.InvariantCulture) == 0) {
+                               } else if (String.Compare (value, "public", true, Helpers.InvariantCulture) == 0) {
                                        Cache.SetCacheability (HttpCacheability.Public);
                                        user_cache_control = "public";
-                               } else if (String.Compare (value, "private", true, CultureInfo.InvariantCulture) == 0) {
+                               } else if (String.Compare (value, "private", true, Helpers.InvariantCulture) == 0) {
                                        Cache.SetCacheability (HttpCacheability.Private);
                                        user_cache_control = "private";
-                               } else if (String.Compare (value, "no-cache", true, CultureInfo.InvariantCulture) == 0) {
+                               } else if (String.Compare (value, "no-cache", true, Helpers.InvariantCulture) == 0) {
                                        Cache.SetCacheability (HttpCacheability.NoCache);
                                        user_cache_control = "no-cache";
                                } else
@@ -1118,8 +1370,13 @@ namespace System.Web {
 
                internal void ReleaseResources ()
                {
-                       output_stream.ReleaseResources (true);
-                       output_stream = null;
+                       if (output_stream != null)
+                               output_stream.ReleaseResources (true);
+                       if (completed)
+                               return;
+                       
+                       Close ();
+                       completed = true;
                }
        }