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Rohan Kumar 2023-08-03 21:14:57 -07:00
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content/notes/permissions-policy-header-bloat.md
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@ -6,11 +6,11 @@ replyTitle: "I think we should be comparing wins relative to HTTP/3 with the lat
replyType: "DiscussionForumPosting" replyType: "DiscussionForumPosting"
replyAuthor: "Anne van Kesteren" replyAuthor: "Anne van Kesteren"
replyAuthorURI: "https://annevankesteren.nl/" replyAuthorURI: "https://annevankesteren.nl/"
#syndicatedCopies: syndicatedCopies:
# - title: 'GitHub' - title: 'GitHub'
# url: '' url: 'https://github.com/w3c/webappsec-permissions-policy/issues/481#issuecomment-1259139696'
# - title: 'The Fediverse' - title: 'The Fediverse'
# url: '' url: 'https://pleroma.envs.net/notice/AYNLYfnnAejTPh4csa'
--- ---
I'm a browser "with the latest in header compression", fetching a web page. I race a TCP-based ALPN run against an HTTPS record lookup (Chromium's behavior). Either the HTTP/2 ALPN wins the race, or the HTTPS DNS record does not exist. Both are, and will remain, common scenarios. So I fetch the page over HTTP/2. This is the initial request; dynamic HPACK hasn't kicked in. I download a 1.56kb HTTP response header: I'm a browser "with the latest in header compression", fetching a web page. I race a TCP-based ALPN run against an HTTPS record lookup (Chromium's behavior). Either the HTTP/2 ALPN wins the race, or the HTTPS DNS record does not exist. Both are, and will remain, common scenarios. So I fetch the page over HTTP/2. This is the initial request; dynamic HPACK hasn't kicked in. I download a 1.56kb HTTP response header: