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<a href="https://gitlab.com/dueno">Daiki Ueno</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1468">#1468</a>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">While those flag and modifier are described similarly in the manual, the actual behavior is a bit different. <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>GNUTLS_NO_EXTENSIONS</code> only disables a certain set of extensions (status request and extended master secret), <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>%NO_EXTENSIONS</code> prevents sending any TLS extensions. We probably should name the former like <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>GNUTLS_NO_DEFAULT_EXTENSIONS</code> and/or document the current behavior properly.</p>
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<pre lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "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: 0.875rem; 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, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">'GNUTLS_NO_EXTENSIONS'</span>
<span id="LC2" class="line" lang="plaintext"> Do not enable any TLS extensions by default (since 3.1.2). As TLS</span>
<span id="LC3" class="line" lang="plaintext"> 1.2 and later require extensions this option is considered obsolete</span>
<span id="LC4" class="line" lang="plaintext"> and should not be used.</span></code></pre>
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<pre lang="plaintext" class="code highlight js-syntax-highlight language-plaintext" data-canonical-lang="" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "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: 0.875rem; 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, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">%NO_EXTENSIONS will prevent the sending of</span>
<span id="LC2" class="line" lang="plaintext"> any TLS extensions in client</span>
<span id="LC3" class="line" lang="plaintext"> side. Note that TLS 1.2</span>
<span id="LC4" class="line" lang="plaintext"> requires extensions to be</span>
<span id="LC5" class="line" lang="plaintext"> used, as well as safe</span>
<span id="LC6" class="line" lang="plaintext"> renegotiation thus this option</span>
<span id="LC7" class="line" lang="plaintext"> must be used with care. When</span>
<span id="LC8" class="line" lang="plaintext"> this option is set no versions</span>
<span id="LC9" class="line" lang="plaintext"> later than TLS1.2 can be</span>
<span id="LC10" class="line" lang="plaintext"> negotiated.</span></code></pre>
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