[SourceMaps] Requests for sourcemaps are done without credentials

[Jason Laster]

CC:
firefox-devtools/debugger#4812
https://bugzilla.mozilla.org/show_bug.cgi?id=1404245

Hi everyone.

It looks like the requests for the sourcemaps (CSS and JS) are done without credentials. I have a 401 error when the site is closed by a login. If I open the access, everything works fine again. The soucemaps work great on Safari and Chrome btw, so it’s not a sourcemaps error.

Here is a screenshot of what happens:

It won't be easy for you to reproduce the bug as I am using Magnolia CMS, but the project is based on https://github.com/frontools/magnolia-megaton so you can at least have a glance to the build process (done with webpack in the /frontend folder).
Thanks