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A comment on DNS over HTTPS–What Is It and Why Do People Care? [pdf]. Parent comment

Re:DNS over HTTPS–What Is It and Why Do People Care? [pdf] by zrm on Monday October 21, 2019 @10:41AM (#21312790)
You can't get 0-RTT with TCP because the TCP handshake itself isn't 0-RTT. HTTP/3 accomplishes it by switching to UDP -- but then you can't get through the legacy middleboxes that only allow HTTPS over TCP port 443.
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