Strange request, there is one comma before HTTP_COOKIE

Question

There is one comma, when tracking the request and var_dump $_SERVER. This caused the web user can not get information by session. Why? How can i sovle it.

[HTTP_USER_AGENT] => Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
[HTTP_ACCEPT_ENCODING] => gzip,deflate
[HTTP_ACCEPT_LANGUAGE] => zh-CN, en-US
[HTTP_ACCEPT_CHARSET] => utf-8, iso-8859-1, utf-16, *;q=0.7
[HTTP_COOKIE] => , FRONTEND=vkq1nq69lhequ5v1v7kor2sj71
[PATH] => /usr/local/bin:/usr/bin:/bin

Answer 1

To me the application sets multiple cookies with the same name, one of it with an empty key and an empty value.

The browser receive the empty cookie and send it back the next request, thus having ", ..." instead of "key=value, ...".

I'd suggest you to inspect your application for wrong setcookie() and header('Cookie:') functions.