diff --git a/core/app.cpp b/core/app.cpp
index 23c3e51..df4ab3c 100755
--- a/core/app.cpp
+++ b/core/app.cpp
@@ -780,6 +780,53 @@ void App::PrepareSessionCookie()
 }
 
 
+bool App::AddHeader(const wchar_t * name, const wchar_t * value)
+{
+	if( !cur.request->out_headers.GetValue(name) )
+	{
+		cur.request->out_headers.Add(name, value);
+		return true;
+	}
+
+return false;
+}
+
+
+bool App::AddHeader(const std::wstring & name, const std::wstring & value)
+{
+	if( !cur.request->out_headers.GetValue(name) )
+	{
+		cur.request->out_headers.Add(name, value);
+		return true;
+	}
+
+return false;
+}
+
+
+bool App::AddHeader(const wchar_t * name, const PT::WTextStream & value)
+{
+	if( !cur.request->out_headers.GetValue(name) )
+	{
+		cur.request->out_headers.Add(name, value);
+		return true;
+	}
+
+return false;
+}
+
+
+bool App::AddHeader(const std::wstring & name, const PT::WTextStream & value)
+{
+	if( !cur.request->out_headers.GetValue(name) )
+	{
+		cur.request->out_headers.Add(name, value);
+		return true;
+	}
+
+return false;
+}
+
 
 bool App::PrepareHeadersStaticCreateResource(PT::WTextStream & out_path)
 {
@@ -837,48 +884,51 @@ void App::PrepareHeadersStatic()
 		return;
 	}
 
-	cur.request->out_headers.Add(config.http_header_send_file, path);
-	cur.request->out_headers.Add(L"Status", L"200 OK");
-	log << log2 << "App: sending a file from a static mountpoint: " << path << logend;
-}
+	AddHeader(L"Status", L"200 OK");
 
+	if( AddHeader(config.http_header_send_file, path) )
+		log << log2 << "App: sending a file from a static mountpoint: " << path << logend;
+}
 
 
 void App::PrepareHeaderContentType()
 {
 	std::wstring * value = 0;
 
-	if( cur.request->return_json )
+	if( !cur.request->out_headers.GetValue(L"Content-Type") )
 	{
-		value = &cur.request->out_headers.Add(L"Content-Type", L"application/json");
-	}
-	else
-	{
-		switch( config.content_type_header )
+		if( cur.request->return_json )
 		{
-			case 1:
-			value = &cur.request->out_headers.Add(L"Content-Type", L"application/xhtml+xml");
-			break;
-
-			case 2:
-			value = &cur.request->out_headers.Add(L"Content-Type", L"application/xml");
-			break;
-	
-			case 0:
-			default:
-			value = &cur.request->out_headers.Add(L"Content-Type", L"text/html");
+			value = &cur.request->out_headers.Add(L"Content-Type", L"application/json");
 		}
-	}
+		else
+		{
+			switch( config.content_type_header )
+			{
+				case 1:
+				value = &cur.request->out_headers.Add(L"Content-Type", L"application/xhtml+xml");
+				break;
+	
+				case 2:
+				value = &cur.request->out_headers.Add(L"Content-Type", L"application/xml");
+				break;
 
-	if( value && config.utf8 )
-		*value += L"; charset=UTF-8";
+				case 0:
+				default:
+				value = &cur.request->out_headers.Add(L"Content-Type", L"text/html");
+			}
+		}
+
+		if( value && config.utf8 )
+			*value += L"; charset=UTF-8";
+	}
 }
 
 
 
 void App::PrepareHeadersForbidden()
 {
-	cur.request->out_headers.Add(L"Status", L"403 Forbidden");
+	AddHeader(L"Status", L"403 Forbidden");
 	PrepareHeaderContentType();
 }
 
@@ -888,47 +938,47 @@ void App::PrepareHeadersRedirect()
 	switch(cur.request->redirect_type)
 	{
 	case 300:
-		cur.request->out_headers.Add(L"Status", L"300 Multiple Choices");
+		AddHeader(L"Status", L"300 Multiple Choices");
 		break;
 
 	case 301:
-		cur.request->out_headers.Add(L"Status", L"301 Moved Permanently");
+		AddHeader(L"Status", L"301 Moved Permanently");
 		break;
 
 	case 302:
-		cur.request->out_headers.Add(L"Status", L"302 Found");
+		AddHeader(L"Status", L"302 Found");
 		break;
 
 	case 307:
-		cur.request->out_headers.Add(L"Status", L"307 Temporary Redirect");
+		AddHeader(L"Status", L"307 Temporary Redirect");
 		break;
 
 	case 303:
 	default:
-		cur.request->out_headers.Add(L"Status", L"303 See Other");
+		AddHeader(L"Status", L"303 See Other");
 		break;
 	}
 
-	cur.request->out_headers.Add(L"Location", cur.request->redirect_to);
+	AddHeader(L"Location", cur.request->redirect_to);
 	log << log2 << "App: redirect to: " << cur.request->redirect_to << logend;
 }
 
 
 void App::PrepareHeadersSendFile()
 {
-	cur.request->out_headers.Add(L"Status", L"200 OK");
-	cur.request->out_headers.Add(config.http_header_send_file, cur.request->x_sendfile);
+	AddHeader(L"Status", L"200 OK");
 
-	log << log2 << "App: sending file: " << cur.request->x_sendfile << logend;
+	if( AddHeader(config.http_header_send_file, cur.request->x_sendfile) )
+		log << log2 << "App: sending file: " << cur.request->x_sendfile << logend;
 }
 
 
 void App::PrepareHeadersCompression(int compress_encoding)
 {
 	if( compress_encoding == 0 || compress_encoding == 1 )
-		cur.request->out_headers.Add(L"Content-Encoding", L"deflate");
+		AddHeader(L"Content-Encoding", L"deflate");
 	else
-		cur.request->out_headers.Add(L"Content-Encoding", L"gzip");
+		AddHeader(L"Content-Encoding", L"gzip");
 }
 
 
@@ -937,7 +987,7 @@ void App::PrepareHeadersNormal(Header header, size_t output_size)
 	switch( header )
 	{
 	case h_404:
-		cur.request->out_headers.Add(L"Status", L"404 Not Found");
+		AddHeader(L"Status", L"404 Not Found");
 		PrepareHeaderContentType();
 		break;
 
@@ -946,12 +996,16 @@ void App::PrepareHeadersNormal(Header header, size_t output_size)
 		break;
 
 	default:
-		cur.request->out_headers.Add(L"Status", L"200 OK");
+		AddHeader(L"Status", L"200 OK");
 		PrepareHeaderContentType();
 	}
 
 	if( output_size != static_cast<size_t>(-1) )
-		cur.request->out_headers.Add(L"Content-Length", output_size);
+	{
+		PT::WTextStream buf;
+		buf << output_size;
+		AddHeader(L"Content-Length", buf);
+	}
 }
 
 
@@ -1011,7 +1065,7 @@ void App::PrepareHeaders(bool compressing, int compress_encoding, Header header,
 	PrepareSessionCookie();
 
 	if( cur.request->send_as_attachment )
-		cur.request->out_headers.Add(L"Content-Disposition", L"attachment");
+		AddHeader(L"Content-Disposition", L"attachment");
 
 	if( !cur.request->redirect_to.empty() )
 	{
@@ -1287,6 +1341,9 @@ int compress_encoding;
 	// then winix would send an incorrect content-lenght header,
 	// we are waiting for the fsck winix function to be implemented
 	PrepareHeaders(compressing, compress_encoding, header, static_cast<size_t>(-1));
+	SendHeaders();
+	SendCookies();
+	FCGX_PutS("\r\n", fcgi_request.out);
 
 	if( CanSendContent() )
 	{
diff --git a/core/app.h b/core/app.h
index dac3697..0790882 100755
--- a/core/app.h
+++ b/core/app.h
@@ -163,6 +163,10 @@ private:
 	void FilterContent();
 	void SendHeaders();
 	void SendCookies();
+	bool AddHeader(const wchar_t * name, const wchar_t * value);
+	bool AddHeader(const std::wstring & name, const std::wstring & value);
+	bool AddHeader(const wchar_t * name, const PT::WTextStream & value);
+	bool AddHeader(const std::wstring & name, const PT::WTextStream & value);
 	bool PrepareHeadersStaticCreateResource(PT::WTextStream & out_path);
 	void PrepareHeadersStatic();
 	void PrepareHeaderContentType();