显示卷曲重定向但不跟随 [英] Show curl redirection but don't follow

问题描述

我有以下代码：

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, "http://www.site.com/check.php?id=1");
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)");
$curlData = curl_exec($curl);
curl_close($curl);
echo $curlData;

远程站点上的脚本将执行一定的检查，并根据检查结果重定向到一个小的15x15的gif图像。

the script on the remote site will perform a certain check, and according to the check results it redirect to a small 15x15 gif image.

目前我有 CURLOPT_FOLLOWLOCATION，1 这意味着它将跟随重定向gif，当我回到 $ curlData 我得到的图像的二进制代码，这不是我想要的。

At the moment I have CURLOPT_FOLLOWLOCATION, 1 which means it will follow the redirection to the gif and when I echo $curlData I get the binary code of the image which is not what I want.

是否可能有curl显示脚本尝试重定向我，而不实际跟踪重定向？所以我可以告诉它是哪个gif图像它重定向我，而不是回应gif内容？

Is it possible to have curl display where the script tries to redirect me without actually following the redirect? So I can tell to which gif image it redirect me to instead of echoing the gif content?

感谢，

推荐答案

轻松！不要设置 CURLOPT_FOLLOWLOCATION ，然后从响应中读取位置标题。

Easily! Don't set CURLOPT_FOLLOWLOCATION, and then read the Location header from the response.

编辑：所以，更多的细节。标题将是状态行后面的响应行，用 \r\\\
分隔。您需要拆分这些行，并查找前缀为位置：的行。这是一个字符串解析练习 - 没有什么可怕的刺激或棘手。您可以使用 curl_getinfo 与 CURLINFO_HEADER_SIZE 标志来发现响应头部分的总长度。

So, a bit more detail. The headers will be the lines of the response just after the status line, separated with \r\n. You'll need to break up these lines, and look for the line prefixed with Location:. This is a string parsing exercise - nothing terribly exciting or tricky. You can use curl_getinfo with the CURLINFO_HEADER_SIZE flag to discover the total length of the header portion of the response.

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