CURL用户代理 [英] The CURL User Agent

问题描述

那么，如果客户端是curl，那么如何检查使用codeigniter，然后返回不同的东西呢？

解决方案

在使用cURL时可以伪造用户代理，因此，当您知道它是cURL请求时，根据用户代理发送的内容无关紧要。

例如：我最近写了一个应用程序，它从google获取一个url的pagerank。现在Google不喜欢这样，所以它只允许某个用户代理访问其pagerank服务器。解？

故事的道德：cURL用户代理是绝对不可靠的。

如果你仍然想要这样做，那么你应该能像正常一样获得传递的用户代理

  $ userAgent = $ _ SERVER ['HTTP_USER_AGENT']; 
 

EDIT 一个快速测试证明了这一点：

dumpx.php：

 <？php 
 
 $ url =http：//localhost/dump.php; 
 
 $ ch = curl_init（）; 
 curl_setopt（$ ch，CURLOPT_URL，$ url）; 
 curl_setopt（$ ch，CURLOPT_FOLLOWLOCATION，1）; 
 if（$ _ GET ['u'] == y）{
 curl_setopt（$ ch，CURLOPT_USERAGENT，booyah！）; 
} 
 curl_setopt（$ ch，CURLOPT_RETURNTRANSFER，0）; 
 
 curl_setopt（$ ch，CURLOPT_CONNECTTIMEOUT，2）; 
 curl_setopt（$ ch，CURLOPT_TIMEOUT，60）; 
 // curl_setopt（$ ch，CURLOPT_CUSTOMREQUEST，'GET'）; 
 curl_setopt（$ ch，CURLOPT_HEADER，0）; 
 $ exec = curl_exec（$ ch）; 
？> 
  

dump.php：

 <？php 
 var_dump（$ _ SERVER）; 
？> 
  

案例1： http：//localhost/dumpx.php？u = y

 'HTTP_USER_AGENT'=>案例2：    /localhost/dumpx.php?u=n\">http://localhost/dumpx.php?u=n  
 
 
 
 否$ _SERVER ['HTTP_USER_AGENT']  
 
 
 
这证明没有curl的默认用户代理：它不会在请求头中传递
 
So how can I check using codeigniter if the client is curl, and then return something different for it?
解决方案
You can fake the user-agent when using cURL, so it's pointless depending on the user-agent sent when you KNOW it's a cURL request.

For example: I recently wrote an app which gets the pagerank of a url from google. Now Google doesn't like this, so it allows only a certain user agent to access its pagerank servers. Solution? Spoof the user-agent using cURL and Google will be none the wiser.

Moral of the story: cURL user agents are JUST NOT reliable.

If you still want to do this, then you should be able to get the passed user agent just like normal
$userAgent=$_SERVER['HTTP_USER_AGENT'];
EDIT A quick test proved this:

dumpx.php:
<?php

    $url="http://localhost/dump.php";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    if($_GET['u']==y) {  
    curl_setopt($ch, CURLOPT_USERAGENT, "booyah!");
    }
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);

    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 2);
    curl_setopt($ch, CURLOPT_TIMEOUT, 60);
    //curl_setopt($ch, CURLOPT_CUSTOMREQUEST,'GET');
    curl_setopt ($ch, CURLOPT_HEADER, 0);
    $exec=curl_exec ($ch);
?>
dump.php:
<?php
    var_dump($_SERVER);
?>
Case 1: http://localhost/dumpx.php?u=y
 'HTTP_USER_AGENT' => string 'booyah!' (length=7)
Case 2: http://localhost/dumpx.php?u=n

No $_SERVER['HTTP_USER_AGENT']

This proves that there is no default user agent for curl: it will just not pass it in the request header

                        
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