First version

allowed_domains.txt

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+# Web access (HTTPS) is allowed only to these domains.
+# One domain per line. Lines starting with # are comments.
+# The local proxy checks the site name of each connection against this list.
+
+# Contest site (Kattis)
+atlantic-canada26.kattis.com
+
+# Kattis service status and the embedded status banner
+status.kattis.com
+1v5nt68l4ppj.statuspage.io
+# Status-page scripts, styles, fonts and images (one CloudFront name only)
+dka575ofm4ao0.cloudfront.net
+
+# Browser error-reporting libraries loaded by the Kattis pages
+js.sentry-cdn.com
+browser.sentry-cdn.com
+
+# Cloudflare challenge, shown if Cloudflare decides to check the browser
+challenges.cloudflare.com
+
+# Licence badges on the problem pages
+licensebuttons.net