Html accessing JS file on Jupyter notebook

I am new to web programming and I have the following issue.

So I am trying to set up a small server on Jupyter notebook. The issue right now is when I do

<script src="../src/main.js">

in my HTML, it cannot find the corresponding JS file. I tried http://localhost:8888/src/main.js as the path but this does not work either as it is forbidden.

I am wondering is there any way to work around this?

Thanks