Title: Cannot modify header information
Last modified: July 25, 2022

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# Cannot modify header information

 *  Resolved [nimonogi](https://wordpress.org/support/users/nimonogi/)
 * (@nimonogi)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-179/)
 * Hello,
 * Any ideas why i am receiving these warnings and how to resolve them?
 * Warning: Cannot modify header information – headers already sent by (output started
   at /usr/www/users/user/wp-content/plugins/woocommerce/includes/wc-core-functions.
   php:2101) in /usr/www/users/ctrlac/wp-content/plugins/wp-cloudflare-page-cache/
   libs/cache_controller.class.php on line 594
 * Warning: Cannot modify header information – headers already sent by (output started
   at /usr/www/users/user/wp-content/plugins/woocommerce/includes/wc-core-functions.
   php:2101) in /usr/www/users/ctrlac/wp-content/plugins/wp-cloudflare-page-cache/
   libs/cache_controller.class.php on line 595
 * Warning: Cannot modify header information – headers already sent by (output started
   at /usr/www/users/user/wp-content/plugins/woocommerce/includes/wc-core-functions.
   php:2101) in /usr/www/users/ctrlac/wp-content/plugins/wp-cloudflare-page-cache/
   libs/cache_controller.class.php on line 596
 * Warning: Cannot modify header information – headers already sent by (output started
   at /usr/www/users/user/wp-content/plugins/woocommerce/includes/wc-core-functions.
   php:2101) in /usr/www/users/ctrlac/wp-content/plugins/wp-cloudflare-page-cache/
   libs/cache_controller.class.php on line 597
 * Warning: Cannot modify header information – headers already sent by (output started
   at /usr/www/users/user/wp-content/plugins/woocommerce/includes/wc-core-functions.
   php:2101) in /usr/www/users/ctrlac/wp-content/plugins/wp-cloudflare-page-cache/
   libs/cache_controller.class.php on line 598

Viewing 1 replies (of 1 total)

 *  Plugin Contributor [iSaumya](https://wordpress.org/support/users/isaumya/)
 * (@isaumya)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-179/#post-15855243)
 * First of all these are warnings – which means you can clearly ignore that. The
   reason you are seeing this is because some other plugin is modifying the response
   header in the website. While this is supposed to be the only plugin that handles
   the header.

Viewing 1 replies (of 1 total)

The topic ‘Cannot modify header information’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [iSaumya](https://wordpress.org/support/users/isaumya/)
 * Last activity: [3 years, 10 months ago](https://wordpress.org/support/topic/cannot-modify-header-information-179/#post-15855243)
 * Status: resolved