Excellent! Might be worth redirecting the root (https://refined-github-html-preview.kidonng.workers.dev/) to this PR or a to a repo containing the code.

Great idea, now the root is redirecting to this PR.

Some pages are showing on Google: https://www.google.com/search?q=site:refined-github-html-preview.kidonng.workers.dev

Can you add an X-Robots-Tag: noindex, nofollow, noarchive header? https://developers.google.com/search/reference/robots_meta_tag

Oops, that's a big oversight. Added x-robots-tag and robots.txt, you can refer to the updated code.

none doesn't include noarchive, which I think means that those 3 links won't be removed.

Also probably we should drop robots.txt because that prevents Google from seeing the robots tag. If I remember correctly, if Google isn't allowed to fetch the links it finds, it will still list them on the SERPs as "Google couldn't fetch the description due to the robots.txt file. more info"

Just noticed how this works:

For the noindex directive to be effective, the page must not be blocked by a robots.txt file. If the page is blocked by a robots.txt file, the crawler will never see the noindex directive, and the page can still appear in search results, for example if other pages link to it.

So I made some changes accordingly. Thanks for the reminder!

I have also submitted removal requests for existing results:

FYI: this feature doesn't work well with private repos - in fact, it looks like a phishing attack, since it renders github 404 screen with the refined-github-html-preview.kidonng.workers.dev in the address bar (and the login form is focused 🙈).

Good point, private repos will be excluded