_invoke overloads for stream algorithms
        </li>
<li class="listitem">
          Add Access-Control-Expose-Headers field constant
        </li>
</ul></div>
<p>
      <span class="bold"><strong>API Changes</strong></span>
    </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
          Remove unintended public members of <code class="computeroutput"><span class="identifier">handler_ptr</span></code>.
          Actions required: don't call non-p