driven by its use-case (interacting with REST servers) and not
        to model HTTP messages generally. We note problems similar to the other declarations:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            There are no compile-time customization points at all. The only customization
            is in the <code class="computeroutput"><span class="identifier">concurrency</span><span class="special">::</span><span class="identifier