<a href="/pkg/crypto/tls#ConnectionState.ExportKeyingMaterial"><code>ConnectionState.ExportKeyingMaterial</code></a> will now
      return an error unless TLS 1.3 is in use, or the <code>extended_master_secret</code> extension is supported by both the server and
      client. <code>crypto/tls</code> has supported this extension since Go 1.20. This can be disabled with the
      <code>tlsunsafeekm=1</code> GODEBUG setting.
    </p>

    </div>
  </div>
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