What is the web server of home assistant?

what is the web server of home assistant? I can not find in the web site.

You can find it in the codebase, it’s https://github.com/aio-libs/aiohttp.

ref:
https://github.com/home-assistant/home-assistant/blob/376d4e4fa0bbcbfa07646f49f9d8fd56c8c0df3c/homeassistant/components/http/init.py#L303-L348

how about the frontend websever? is it usbed nodejs?

haven’t looked at it but I expect it’s a SPA that’s being served by the aiohttp as a static file.