Support » Plugin: Yoast SEO: Search Index Purge » Cannot modify header information

  • Ambyomoron


    Could someone please explain the significance of this PHP message:
    PHP Warning: Cannot modify header information - headers already sent by (output started at /blahblah/wp-content/plugins/yoast-seo-search-index-purge/src/Yoast_Purge_Attachment_Page_Server.php:46) in /blahblah/wp-content/plugins/wp-content-security-policy/includes/WP_CSP.php on line 548
    This message is displayed regularly in the web server error log. It occurs principally when a search engine spider visits my site.
    Is there something I should do to avoid this warning?

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