Title: Undefined variable: vary_header and cache_control_header
Last modified: April 27, 2020

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# Undefined variable: vary_header and cache_control_header

 *  [Evgeny Vlasenko](https://wordpress.org/support/users/mahnunchik/)
 * (@mahnunchik)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/undefined-variable-vary_header-and-cache_control_header/)
 * Hi, I’ve faced with the following errors:
 *     ```
       Notice: Undefined variable: vary_header in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache.php on line 3460
   
       Notice: Undefined variable: cache_control_header in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache.php on line 3463
       ```
   
 * To reproduce set constants to empty string:
 *     ```
       define('WPSC_VARY_HEADER', '');
       define('WPSC_CACHE_CONTROL_HEADER', '');
       ```
   
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fundefined-variable-vary_header-and-cache_control_header%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [Donncha O Caoimh (a11n)](https://wordpress.org/support/users/donncha/)
 * (@donncha)
 * [5 years, 11 months ago](https://wordpress.org/support/topic/undefined-variable-vary_header-and-cache_control_header/#post-13062531)
 * Thanks for reporting that. I’ll get it fixed in the next release.

Viewing 1 replies (of 1 total)

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 * 1 reply
 * 2 participants
 * Last reply from: [Donncha O Caoimh (a11n)](https://wordpress.org/support/users/donncha/)
 * Last activity: [5 years, 11 months ago](https://wordpress.org/support/topic/undefined-variable-vary_header-and-cache_control_header/#post-13062531)
 * Status: not resolved