css not loaded because of MIME type mismatch

[miguelmarco]

Description

If I run a local instance of jupyterlab with rise enabled, can't load custom rise.css or notebookname.css files. The console in my broser shows the error message:

The resource from  “http://localhost:8888/files//rise.css” was blocked due to a MIME type mismatch (“text/html”) (X-Content-Type-Options: nosniff).

Reproduce

1. Install jupyterlab_risewith pip
2. Create a simple notebook and rise.css file
3. show the notebook with rise

Expected behavior

the rise presentation is decorated according to the rules in rise.css

Context

• Python package version:

• Extension version: jupyterlab_rise 0.2.0

• Operating System and its version: Gentoo linux

• Browser and its version: firefox 102.9.0esr

[steff-mueller]

I noticed that rise.css gets loaded successfully if one puts the notebook and rise.css into a subdirectory instead of root. Otherwise, I get the same error.

[trevex]

Thanks @steff-mueller using a sub-folder is indeed a workaround.

Looks like the double-slash causes the issues. Manipulating the original request from the root folder to have a single / in the path will result in successfully returning the CSS.