-<p id="section-9.1-2">This is similar to the "alternate" link relation, except that it specifies the substitute is optional. In some applications, a client may fetch all alternates, so that it may forward one of the alternates to another party. For example, <span><a href="https://rfc-editor.org/rfc/rfc8555#section-7.4.2" class="relref">Section 7.4.2</a> of [<a href="#RFC8555" class="cite xref">RFC8555</a>]</span> describes how an ACME server uses the "alternate" link relation to serve multiple certificate chains for an ACME order. An ACME client might then fetch all of them and configure them in a TLS server, which presents them to TLS clients. Different TLS clients need different chains, so the ACME client would treat any unavailable alternate as an error.<a href="#section-9.1-2" class="pilcrow">¶</a></p>
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