Function Perflab_Server_Timing::send_header was called incorrectly

  • jwriley

    (@jwriley)


    1 year, 2 months ago

    Seeing this on my staging server where I show errors and notices. Page seems to otherwise be rendering just fine.

    Notice: Function Perflab_Server_Timing::send_header was called incorrectly. The method must be called before headers have been sent. Please see Debugging in WordPress for more information. in /var/www/our-wordpress/html/wordpress/wp-includes/functions.php on line 6114

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  • Plugin Author Weston Ruter

    (@westonruter)

    1 year, 2 months ago

    If you go to the Tools > Server-Timing screen in the wp-admin (/wp-admin/tools.php?page=perflab-server-timing), make sure you have the “Enable output buffering of template rendering” checkbox enabled. It is most likely unchecked on your site, while at the same time you have an action or filter in the textboxes below which refer to a hook that is called while the template is rendered.

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