hidori

<p>DNSでは"_"入りのサブドメインを設定することができるが、利用すると思わぬところでバグを踏む可能性がある。<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__7e6e29bf73227" src="https://embed.zenn.studio/card#zenn-embedded__7e6e29bf73227" data-content="https%3A%2F%2Fstackoverflow.com%2Fquestions%2F59318025%2Fcertificate-verify-failed-hostname-mismatchhandshake-cc352-for-tcp-connecti" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://stackoverflow.com/questions/59318025/certificate-verify-failed-hostname-mismatchhandshake-cc352-for-tcp-connecti" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://stackoverflow.com/questions/59318025/certificate-verify-failed-hostname-mismatchhandshake-cc352-for-tcp-connecti</a></p>
<p>そもそもRFC952で定義された、ドメイン名に利用可能な文字に"_"は含まれていない。<br style="display:none">
<span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__289b97d2dccad" src="https://embed.zenn.studio/card#zenn-embedded__289b97d2dccad" data-content="https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc952" frameborder="0" scrolling="no" loading="lazy"></iframe></span><a href="https://datatracker.ietf.org/doc/html/rfc952" style="display:none" target="_blank" rel="nofollow noopener noreferrer">https://datatracker.ietf.org/doc/html/rfc952</a></p>
