Set-Cookie存在于标头响应中，但在浏览器中缺失

Question

Basically Session is not working. Session is getting generated and getting stored in the proper folder of the server, but not getting stored in the browser as the usual PHPSESSID cookie . The phpinfo() shows that the Set-Cookie headers are being sent, but Set-Cookie headers are missing in the response that the browser gets. Please check the below screenshots:

Set-Cookie headers present from the server side:

Set-Cookie headers missing in the response the browser gets:

Another info is, if I use javascript to set cookie then it works and shows up in the browser's developer tool.

Everything regarding session is ok, just that the cookie it tries to set on the browser seems to be not setting.

Answer 1

Answering the cause and fix as it may help someone in future and save many hours:

This error happened in a site previously built by someone else. This error seemed quite unusual and I thought the problem is most probably with Apache. I removed Apache and reinstalled to no effect. Then I installed Nginx to see if the problem is with the Web Server software or the Server itself. And I found that Session is working fine in Nginx. So the problem was definitely with Apache somewhere.

As I checked the files found that in the .htaccess file somewhere down below Cookie was unset !!

Header unset Cookie
Header unset Set-Cookie

Never thought someone would have put that! But anyway, removing the above fixed the problem.

Answer 2

Encountered the same behavior with a service provider of mine. Turned out to be a caching problem on their side (varnish cache).

Luckily I was able to disable Varnish-Cache via the provided admin-backend. After that, the Set-Cookie headers were present in the client response.