Published on: 2025-04-29 08:23:30
*Authors in alphabetical order – all contributed equally Abstract Censors worldwide have long censored unencrypted HTTP traffic. In this blog post, we show that a specific HTTP version—unencrypted HTTP/2—is unaffected by censorship in China and Iran. We access otherwise censored websites in both countries over unencrypted HTTP/2. Despite no web browser implementing unencrypted HTTP/2, we detect that up to 6.28% of websites support unencrypted HTTP/2 traffic. To aid the community and ease futur
Keywords: censorship http support unencrypted upgrade
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