"k">use</span> <span class="w">HTTP::Proxy</span><span class="sc">;</span>
    <span class="k">use</span> <span class="w">HTTP::Proxy::HeaderFilter::simple</span><span class="sc">;</span>
    <span class="k">use</span> <span class="w">Fcntl</span> <span class="q">':flock'</span><span class="sc">;</span>
    <span class="k">use</span> <span class="w">strict</span><span class="sc">;</span>
    
    <span class="k">my</span> <span class="i">$file</span> = <span class="k">shift</span> || <span class="q">'-'</sp