Busybox is a collection of very small linux tools that can be helpful when you want to build a very small system. Among them there is a httpd server that can serve static pages. You can use this server to serve files from a folder.
My problem was trying to serve some wasm+javascript files built from rust code: the MIME type for the .wasm file was not sent.
I fixed this by creating a httpd.conf file and added these lines to it:
.wasm:application/wasm .js:text/javascript .json:application/json .html:text/html
.html was probably not necessary :-) .
Starting the server:
$ busybox httpd -p 127.0.0.1:8080 -h ./ -c httpd.conf
