#section-6.4.7">Section&nbsp;6.4.7 of [RFC7231]</a> states that HTTP does not define a
   permanent variant of status code 307; this specification adds the
   status code 308, defining this missing variant (<a href="#section-3">Section 3</a>).

<span class="h2"><a class="selflink" name="section-2" href="#section-2">2</a>.  Notational Conventions</span>

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document a