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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_110176085">doc/cha-gtls-app.texi</a>:
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="plaintext">@funcref{gnutls_init}, and the @funcref{gnutls_handshake} function will</span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="plaintext">return early, allowing the server to send data earlier.</span>
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<td class="diff-line-num new_line" data-linenumber="918" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC918" class="line" lang="plaintext"></span>
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<td class="diff-line-num new_line old" data-linenumber="919" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC918" class="line" lang="plaintext">Under TLS 1.3, when the server and client share a @acronym{PSK}, the</span>
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<pre style="margin: 0;">-<span id="LC919" class="line" lang="plaintext">client side can start transmitting application data during handshake.</span>
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<pre style="margin: 0;">-<span id="LC920" class="line" lang="plaintext">This is called zero round-trip time (0-RTT) mode, and the application</span>
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<td class="diff-line-num old old_line" data-linenumber="921" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC921" class="line" lang="plaintext">data sent in this mode is called early data.</span>
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="plaintext">@node Zero-roundtrip mode</span>
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="plaintext">@subsection Zero-roundtrip mode</span>
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="plaintext">Under TLS 1.3, when the client has already connected to the server and</span>
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="plaintext">is resuming a session, it can start transmitting application data during</span>
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="plaintext">handshake. This is called zero round-trip time (0-RTT) mode, and the</span>
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<td class="diff-line-num new new_line" data-linenumber="926" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="plaintext">application data sent in this mode is called early data. The client can</span>
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="plaintext">send early data with @funcref{gnutls_record_send_early_data}.</span>
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<p dir="auto">It is mentioned in the function documentation, but let me add it here as well.</p>
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