初步完成HTTP应答侧解析功能，并修正一系类错误处理类的问题。

plugin/protocol/http/include/internal/http_half.h

@@ -94,3 +94,8 @@ struct http_session_private * hs_private_create(struct http_connection_private *
 	struct http_half_private * hf_private_req, struct http_half_private * hf_private_resp);
 
 void hs_private_destory(struct http_session_private * hs_private);
+
+void hs_private_hf_private_set(struct http_session_private * hs_private,
+	struct http_half_private * hf, enum tfe_http_direction);
+
+struct http_half_private * hs_private_hf_private_release(struct http_session_private * hs_private, enum tfe_http_direction);