Reset connection state after finishing with it in http_handler

src/connection_handler.hpp

@@ -55,21 +55,6 @@ public:
    */
   virtual void on_write_progress(Connection &) {}
 
-  /**
-   * Called when the connection's outgoing write buffer becomes empty.
-   *
-   * This indicates all queued messages have been successfully written
-   * to the socket. Useful for:
-   * - Implementing keep-alive connection reuse
-   * - Closing connections after final response
-   * - Relieving backpressure conditions
-   *
-   * @param conn Connection with empty write buffer - server retains ownership
-   * @note Called from this connection's io thread.
-   * @note Only called on transitions from non-empty → empty buffer
-   */
-  virtual void on_write_buffer_drained(Connection &) {}
-
   /**
    * Called when a new connection is established.
    *
@@ -96,9 +81,9 @@ public:
   /**
    * @brief Called after a batch of connections has been processed.
    *
-   * This hook is called after on_data_arrived, on_write_progress, or
-   * on_write_buffer_drained has been called for each connection in the batch.
-   * All connections remain server-owned.
+   * This hook is called after on_data_arrived or on_write_progress has been
+   * called for each connection in the batch. All connections remain
+   * server-owned.
    *
    * @param batch A span of connection references in the batch.
    * @note Called from this connection's io thread.