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AFAIK that proposal got dropped in favor of ECH, which isn't standardized yet [0]. [0] https://blog.cloudflare.com/announcing-encrypted-client-hello/ https://b

• btdmaster 3y ago
  Although it is not fully standardised, Firefox 119 and later should have it work [1]. It's now up to server implementations to get there as well. [1] https://defo.ie/ech-check.php https://defo.ie/ech-check.php