Static "Hello world" page

fastcgi.h

@@ -1,10 +1,16 @@
 #pragma once
 
+#include <functional>
+#include <memory>
+
+#include "fastcgi_request.h"
+
 class FastCGIServer {
   public:
-  	FastCGIServer(int port);
+  	FastCGIServer(int port, const std::function<void(std::unique_ptr<FastCGIRequest>)>& callback);
 	void Serve();
 
   private:
 	int listen_sock_;
+  	std::function<void(std::unique_ptr<FastCGIRequest>)> callback_;
 };