Website lateral menu doesn't load without javaScript

[apiraino]

Visiting https://forge.rust-lang.org/ with JavaScript disabled does not load the lateral menu.

Screenshot

The error page in the screenshot leads to this Mozilla support page:
https://support.mozilla.org/en-US/kb/xframe-neterror-page

Trying to understand where the issue is, I did some tests:

• I can reproduce this also on Firefox Linux stable (141.0.3), fresh install and no other extension than the one to disable JS
• I've tried building the website and serving from localhost:3000 and I can't reproduce, the menu works just fine without JavaScript. I've built with mdbook 0.4.51 and 0.4.52
• The rustc-dev website does not show this behaviour (works just fine without JavaScript)

I can't say a lot more because I am not familiar with the deploying of this website so I'm not sure I can pin this issue on MDBook or on the website code.

Any idea where the problem could be?

thanks

[ehuss]

The issue is the CloudFront is setting x-frame-options: DENY.

I have asked in https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/forge.20cloudfront/with/534993340 about why we are using cloudfront at all.