Separate Connection and Request lifetimes

src/server.hpp

@@ -148,6 +148,8 @@ private:
   void process_connection_reads(Ref<Connection> &conn_ptr, int events);
   void process_connection_writes(Ref<Connection> &conn_ptr, int events);
 
+  void close_connection(Ref<Connection> &conn);
+
   // Helper for processing a batch of connections with their events
   void process_connection_batch(int epollfd, std::span<Ref<Connection>> batch,
                                 std::span<const int> events);