cUrl保持跟随位置标题

Question

Okay I post 2 fields to a url using cUrl, this page checks my post fields and based on them it returns me cookies. However before i can even read the cookies I'm already redirected to an other page.
I tried setting _FOLLOWLOCATION, 0 but I'm still getting redirected. Are there any thoughts on this?
Code:

$headers[] = "Accept: */*";
$headers[] = "Connection: Keep-Alive";
$headers[] = "Content-type: application/x-www-form-urlencoded;charset=UTF-8";

$fields_string = "login_url=/login.do?school=windesheim";
$fields_string=rtrim($fields_string, "&");
$cSession = curl_init(); 
$tmpfname = dirname(__FILE__).'/cookie2.txt';
curl_setopt($cSession, CURLOPT_REFERER,  "https://website.com/login.do?error=nomandant");
curl_setopt($cSession, CURLOPT_HTTPHEADER,  $headers)
curl_setopt($cSession, CURLOPT_COOKIEFILE, $tmpfname);
curl_setopt($cSession, CURLOPT_COOKIEJAR, $tmpfname);
curl_setopt($cSession,CURLOPT_URL,"https://website.com/j_spring_security_check");
curl_setopt($cSession,CURLOPT_RETURNTRANSFER,true);
curl_setopt($cSession, CURLOPT_FOLLOWLOCATION, 0);
curl_setopt($cSession, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($cSession, CURLOPT_SSL_VERIFYPEER, false); 
curl_setopt($cSession,CURLOPT_HEADER, true); 
curl_setopt ($cSession, CURLOPT_POST, true);
curl_setopt ($cSession, CURLOPT_POSTFIELDS, $fields_string);
curl_setopt($cSession,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13');
$result=curl_exec($cSession);
curl_close($cSession);
echo htmlspecialchars($result);

If I print the header it says location: https://website.com/login.do?error=nomandant

So I go to this page, I can't get the cookies because I'm redirected to the next page which then redirects me back to the first page because I don't have the cookies set. I want to get on the first page, don't be redirected, and read the cookies from the header.
How come that I'm being redirected even though followlocation is set to 0/false?

Update:
When I'm in my browser at website.com and I enter Windesheim in postfield and post it this it posts to /j_spring_security_check

So i try to simulate this using cUrl using the code from above (updated with more info). But the output is only:

HTTP/1.1 302 Found Connection: Keep-Alive Content-Length: 0 
Date: Sat, 16 Nov 2013 14:28:33 GMT 
Location: https://website.com/login.do?error=nomandant Server: Apache-Coyote/1.1

The expected result is something like the response header in the picture above.
So something is going wrong that it is redirecting me to

/login.do?error=nomandant 

instead of

/index.do;jsessionid=etc.

But I can't figure out what I am doing wrong as there are only 2 field being posted and I included them both in my code.

Answer 1

First, note that you'll be able to read cookies after the session is closed with curl_close.

See http://php.net/manual/en/function.curl-setopt.php

From what you say you're actually being redirected by the server to another location, but curl is not following that location. This is the reason you see an header with a redirection.

curl is behaving as expected!

If you set it to follow the new location you would see the haeder and the page at the new location https://website.com/login.do?error=nomandant

Given the data you're posting to the URL the server wants to send you back to https://website.com/login.do?error=nomandant

If this is not what you expect either the cookies you're sending with the request are not good (for example missing session value...) or you're posting the wrong data.