Expires, why is the date 1981?

Question

Nginx

Goodnight!
Found that my server response contains Expires with a strange date:
Expires: Thu, 19 Nov 1981 08:52:00 GMT
What does this mean? Is it bad that the date has passed and how to fix it? Apache + nginx server

Answer 1

Usually such headers are thrown, so that they are probably not stored in the cache.

Answer 2

This date is the birthday of one of the developers of the `session` extension for PHP ( https://stackoverflow.com/questions/8194481/why-is... )
This header (also `Pragma: no-cache`) is added automatically when the session is started (`session_start()`) to disable the cache. The date, in fact, is not important, the main thing is that it be from the past so that the cache is considered invalid.