搜索栏不支持https的解决办法

<p class="search">

<form action="/do/search.php" method="get" target="_blank" class="bdcs-search-form" id="bdcs-search-form">

        <input name="s" value="10520733385329581432" type="hidden">

        <input name="entry" value="1" type="hidden">

        <input name="ie" value="gbk" type="hidden">

        <input name="nsid" value="3" type="hidden">

        <input name="ie" value="gbk" type="hidden">

<input type="text" placeholder="请输入您感兴趣的关键字" value="" id="search_txt1" maxlength="18" class="search_txt" name="q">

<input class="search_btn" value="搜 索" type="submit">

</form>

</p>

<?php

error_reporting(E_ALL & ~E_NOTICE);

$s=is_numeric($_GET['s'])?$_GET['s']:0;

$entry=$_GET['entry']?intval($_GET['entry']):0;

$nsid=$_GET['nsid']?intval($_GET['nsid']):0;

$ie=$_GET['ie']?substr($_GET['ie'],0,3):0;

$q=$_GET['q']?urlencode($_GET['q']):'';

$url_str="http://so.jb51.net/cse/search?s=$s&entry=$entry&ie=$ie&nsid=$nsid&ie=$ie&q=$q";

header("Location: $url_str");

?>