I went through the tutorial and found two issues with loading data.
https://dart.dev/tutorials/web/fetch-data#using-getString-function
https://dart.dev/tutorials/web/fetch-data#making-a-get-request
In both cases, the request fails and the data is not loaded. In network monitoring, I see both of those requests as canceled.

It looks like we just need to update the gists to change www.dartlang.org to dart.dev. Here's a similar change:
https://github.com/dart-lang/site-www/issues/1800#issuecomment-536180384
Hello @kwalrath
Can I fixed this one?
Yes, please, @wang-ories! oops
@kwalrath Updated the gist in my fork https://gist.github.com/dhanushuUzumaki/7f53d30c278259db277373944057e0f8
Your changes look good, and I've forked them here:
https://gist.github.com/kwalrath/f8aa7310e96d359c5f68343c9ccba8ed
Now you just need to create a PR that embeds f8aa7310e96d359c5f68343c9ccba8ed instead of the current gist.
(Of course, there are two samples that need to be updated.)
PR created - https://github.com/dart-lang/site-www/pull/1971
Regards,
Dhanushu
Oops, @wang-ories, I didn't remember that @dhanushuUzumaki had already started on this.
Could you please pick another bug?
Sorry, @wang-ories I didn't saw the earlier comment.
@kwalrath It is Ok, I will pick another bug .