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<a href="https://gitlab.com/bagder">Daniel Stenberg</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1548#note_1874924520">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">RFC 2818 section 3.1 says:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">In general, HTTP/TLS requests are generated by dereferencing a URI.</span>
<span id="LC2" class="line" lang="plaintext">As a consequence, the hostname for the server is known to the client.</span>
<span id="LC3" class="line" lang="plaintext">If the hostname is available, the client MUST check it against the</span>
<span id="LC4" class="line" lang="plaintext">server's identity as presented in the server's Certificate message,</span>
<span id="LC5" class="line" lang="plaintext">in order to prevent man-in-the-middle attacks.</span></code></pre>
<copy-code></copy-code>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">The hostname here can have a trailing dot. The SNI name does not.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">RFC 9525 section 6.1 is less specific but says:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">The inputs used by the client to construct its list of reference identifiers might </span>
<span id="LC2" class="line" lang="plaintext">be a URI that a user has typed into an interface (e.g., an HTTPS URL for a website)</span></code></pre>
<copy-code></copy-code>
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<p dir="auto" style="color: #333238; margin: 0;" align="initial">Again, that is the hostname. Not the SNI name.</p>
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