tion"><a href="dart-io/HttpRequest-class.html">HttpRequest</a></span> <span class="parameter-name">request</span>, {</span> <span class="parameter" id="upgrade-param-protocolSelector"><span class="type-annotation">dynamic</span> <span class="parameter-name">protocolSelector</span>(<span class="parameter" id="protocolSelector-param-protocols"><span class="type-annotation"><a href="dart-core/List-class.html">List</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/String-class.