Apr 15 2008
Fix TinyMCE spellchecker failing on Gzip-ed sites
Those who’d enabled Gzip through Litespeed (unconfirmed on other servers) might find that the spellchecker in Wordpress 2.5 no longer works. This is due to TinyMCE not decompressing the compressed output into plain text (my speculation).
To fix this, edit /wp-includes/js/tinymce/plugins/spellchecker/rpc.php
Change the following line:
header(‘Content-Type: text/plain’);
to
header(‘Content-Type: text/xml’);
or anything that Litespeed is not set to compress (Usually anything other than text/plain, text/html and application/x-php).