为何php curl post模式发送数据速度变慢了？我来说说原因

事例：

今天要向一台服务器上传文件，原版是curl的get模式，现在改用了post模式，按照原本的思想，代码如下

 <?php
 $post['c'] = 'config';
 $post['t'] = 'show';
 $post['o'] = 'xml';
 $post['ssid'] = '%07o%B4%88O%EE%0Ca%07%DA%D8i%D36HE%AF%28%BC%3C%BE%D5s%DFv%A6%D83%D9%3E%16%96U%B4q%BA%0A%9A%DE%F0%BFJjh%DF2%FF%D2';

 $curl = curl_init();
 curl_setopt($curl, CURLOPT_URL,"http://172.16.59.130:28099/cgi-bin/japi.cgi");
 curl_setopt($curl, CURLOPT_POST, true);
 curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
 curl_setopt($curl, CURLOPT_ENCODING, "gzip");
 curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.111 Safari/537.36
 Accept-Encoding: gzip,deflate,sdch");

 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($curl, CURLINFO_HEADER_OUT, true);
 curl_setopt($curl, CURLOPT_FOLLOWLOCATION, false);
 $contents = curl_exec($curl);
 curl_close($curl);
 echo $contents;
 ?>

但是耗时总是在2s左右，而用get模式则是很快，刚开始怀疑是服务器的问题，但是抱着试试看的态度，查了下curl  post有什么特殊的地方，这还真发现了。

在php curl post模式上，启用时会发送一个常规的POST请求，类型为：application/x-www-form-urlencoded，就像表单提交的一样。

如果把要post的数组转换成字符串，像get那种url，速度就上来了

 <?php
 $post['c'] = 'config';
 $post['t'] = 'show';
 $post['o'] = 'xml';

 $post = http_build_query($post);
 $post .= "&ssid=%07o%B4%88O%EE%0Ca%07%DA%D8i%D36HE%AF%28%BC%3C%BE%D5s%DFv%A6%D83%D9%3E%16%96U%B4q%BA%0A%9A%DE%F0%BFJjh%DF2%FF%D2";

 $curl = curl_init();
 curl_setopt($curl, CURLOPT_URL,"http://172.16.59.130:28099/cgi-bin/japi.cgi");
 curl_setopt($curl, CURLOPT_POST, true);
 curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
 curl_setopt($curl, CURLOPT_ENCODING, "gzip");
 curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.111 Safari/537.36
 Accept-Encoding: gzip,deflate,sdch");

 curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($curl, CURLINFO_HEADER_OUT, true);
 curl_setopt($curl, CURLOPT_FOLLOWLOCATION, false);
 $contents = curl_exec($curl);
 curl_close($curl);
 echo $contents;
 ?>