diff --git a/application.h b/application.h
index fa92e7f..63c8eff 100644
--- a/application.h
+++ b/application.h
@@ -31,6 +31,7 @@ struct application {
 	void set_header(HTTPHeader *h) { worker.set_header(h); }
 	void add_header(string s) { worker.add_header(s); }
 	void set_cookie(cgicc::HTTPCookie const &c) { worker.set_cookie(c); }
+	void set_user_io() { worker.set_user_io(); }
 
 	HTTPHeader &header() { return worker.header(); }
 
diff --git a/hello_world.cpp b/hello_world.cpp
index 4ea7b0d..a4ad616 100644
--- a/hello_world.cpp
+++ b/hello_world.cpp
@@ -13,14 +13,40 @@ public:
 		url.add("^/test$",boost::bind(&my_hello_world::test,this));
 		url.add("^/test2$",boost::bind(&my_hello_world::test2,this));
 		url.add("^/cache$",boost::bind(&my_hello_world::cache_test,this));
+		url.add("^/png$",boost::bind(&my_hello_world::png,this));
 		use_template("view2");
 	};
 	void test();
+	void png();
 	void test2();
 	void std();
 	void cache_test();
 };
 
+void my_hello_world::png()
+{
+	ifstream file("test.png");
+	if(!file) {
+		cout<<"File test.png not found";
+		return ;
+	}
+	vector<char> buffer(1024);
+	set_user_io();
+
+	ostream &cout=cgi_conn->cout();
+	set_header(new cgicc::HTTPContentHeader("image/png"));
+	session.save();
+	cout<<header();
+
+	for(;;) {
+		file.read(&buffer.front(),1024);
+		cout.write(&buffer.front(),file.gcount());
+		if(file.eof())
+			break;
+	}
+	file.close();
+}
+
 
 void my_hello_world::test2()
 {
diff --git a/session_interface.cpp b/session_interface.cpp
index 52fc921..53d125d 100644
--- a/session_interface.cpp
+++ b/session_interface.cpp
@@ -94,6 +94,7 @@ bool session_interface::load()
 	timeout_val=timeout_val_def;
 	how=how_def;
 	string ar;
+	saved=false;
 	if(!storage.get() || !storage->load(this,ar,timeout_in)) {
 		return false;
 	}
@@ -210,6 +211,8 @@ void session_interface::update_exposed()
 
 void session_interface::save()
 {
+	if(saved)
+		return;
 	check();
 	new_session  = data_copy.empty() && !data.empty();
 	if(data.empty()) {
@@ -242,6 +245,7 @@ void session_interface::save()
 	temp_cookie.clear();
 
 	update_exposed();	
+	saved=true;
 }
 
 void session_interface::on_start()
diff --git a/session_interface.h b/session_interface.h
index d433bd4..26fa6d3 100644
--- a/session_interface.h
+++ b/session_interface.h
@@ -42,13 +42,13 @@ class session_interface : private boost::noncopyable {
 	// Information from session data
 	time_t timeout_in;
 	bool new_session;
+	bool saved;
 
 	int cookie_age();
 	time_t   session_age();
 
 	void check();
 	bool load();
-	void save();
 	void update_exposed(); 
 
 	std::string temp_cookie;
@@ -87,6 +87,7 @@ public:
 	void set_expiration(int h);
 	void set_age();
 	void set_expiration();
+	void save();
 
 // Special interface
 	void set_session_cookie(std::string const &data);
diff --git a/worker_thread.cpp b/worker_thread.cpp
index 5fc4b4b..f643028 100644
--- a/worker_thread.cpp
+++ b/worker_thread.cpp
@@ -50,6 +50,11 @@ void worker_thread::set_cookie(cgicc::HTTPCookie const &c)
 	response_header->setCookie(c);
 }
 
+void worker_thread::set_user_io()
+{
+	user_io=true;
+}
+
 void worker_thread::set_lang(string const &s)
 {
 	lang=s;
@@ -80,6 +85,7 @@ void worker_thread::run(cgicc_connection &cgi_conn)
 	set_header(new HTTPHTMLHeader);
 
 	gzip=gzip_done=false;
+	user_io=false;
 	string encoding;
 
 	if((encoding=cgi_conn.env("HTTP_ACCEPT_ENCODING"))!="") {
@@ -116,6 +122,11 @@ void worker_thread::run(cgicc_connection &cgi_conn)
 		cgi_out<<*h<<"\n";
 	}
 
+	if(user_io) {
+		// user controls it's IO
+		return;
+	}
+
 	string out=out_buf.str();
 	out_buf.str("");
 
@@ -170,6 +181,8 @@ void worker_thread::render(string name,base_content &content)
 	render(current_template,name,content,cout);
 };
 
+
+
 }
 
 
diff --git a/worker_thread.h b/worker_thread.h
index f5d2a80..c264ad1 100644
--- a/worker_thread.h
+++ b/worker_thread.h
@@ -41,6 +41,7 @@ class worker_thread: private boost::noncopyable {
 
 	list<string> other_headers;
 	base_cache *caching_module;
+	bool user_io;
 	bool gzip;
 	bool gzip_done;
 	stringbuf out_buf;
@@ -68,6 +69,7 @@ public:
 	void set_header(HTTPHeader *h);
 	void add_header(string s);
 	void set_cookie(cgicc::HTTPCookie const &c);
+	void set_user_io();
 
 	HTTPHeader &header();