Failed to send buffer of zlib output compression

  • Sometimes I get “Notice: ob_end_flush(): Failed to send buffer of zlib output compression (1) in D:\xampp\htdocs\website\wp-includes\functions.php on line 5107” message on PHP8 with WP5.8. No plugin activated, using TwentyTwenty One theme.

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  • This is, unfortunately, a loooooong running bug… going back 10+ years! See tickets 18525 and 22430.

    Kindly check out the two tickets linked above to understand the problem, and try any of the suggested hacks.

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