cURL请求不接受cookie，导致无限重定向

I am trying to build a cURL request to download a pdf. I am getting the "Error:Maximum (100) redirects followed" error and believe it is due to a cookie issue. Here's the relevant code from my cURL request:

$cookie_file = "/home/mrpeanut/php/cookie.txt"
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERAGENT, $agent);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSLVERSION, 4);
curl_setopt($ch, CURLOPT_SSL_CIPHER_LIST, implode(':', $arrayCiphers));
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_MAXREDIRS, 100);
curl_setopt($ch, CURLOPT_TIMEOUT, 20);
curl_setopt($ch, CURLOPT_COOKIEJAR, realpath($cookie_file));
curl_setopt($ch, CURLOPT_COOKIEFILE, realpath($cookie_file));

And have also tried CURLOPT_COOKIEJAR, '-' (from here), all without luck. The pdf downloads just fine using a browser. However, it downloads even if I disable all cookies using the Web Developer toolbar (so maybe that's not my true issue?).

You need to send CURLOPT_COOKIE with the value of your PHPSESSID. That is how the server is going to identify the cookie.

You should add this

curl_setopt($ch, CURLOPT_COOKIE, 'PHPSESSID=' . $_COOKIE['PHPSESSID'] . '; path=/');