An Tao

> I realize HTTP 3 is a very complicated topic. Maybe its worth to check if we can add a lib that already implements it? And just wrap it in...

> @an-tao , Drogon v2 will add asio's support only the boost libraries version or also support the standalone version? It uses the standalone version as the networking library.

> 2.0 名字也建议换成 2024 官方的 Loong drogon 之前的翻译有问题 类似于会飞的蜥蜴 谢谢你的建议，不过Drogon是角色名字不是物种名字（dragon），请参考readme的说明。

@ken-matsui Would you please add a section to the wiki-doc for this patch? thanks so much.

You could use the std::optional

Why not to create a `makeStringOptional` function for doing the same thing?

> Performance-wise will newFileResponse calls in the custom error handler be cached? If every request hitting the error handler ends up making an OS file request repeatedly then that will...

You should move the newFileResponse code to the handler and cache the old response by yourself.

c++14的分支可以

Yes, currently you can't regitster a handler after running.