I have a chunk of code to login to test a web site login: $r = new HttpRequest($newlocation, HttpRequest::METH_GET); $r-addCookies($cookieArray); $r-send(); The content of $cookieArray is from a redirect, but I don't modify it in any way. The really baked part is that if the value of the cookie (an authentication token string) contains a slash, it doesn't login properly. If it doesn't have a slash, everything works. Any ideas are appreciated.