Ask HN: Are you using a web server on your phone?

If so, please give details. Whatever you feel like giving, but in general, the server used, any extra libs or apps used with it, and the uses you put the whole setup to, would be interesting to know about. Question inspired by this recent thread about file transfer:

How to copy a file between devices? (2022)

https://news.ycombinator.com/item?id=39377382

about this post:

https://grdw.nl/2022/10/03/how-to-copy-a-file-between-devices.html

Thanks in advance.