Yet Another WordPress Flash Uploader Problem (with solution!)

This was a new one for me. Every time I tried to upload a photo to a WordPress site, I received a very informative “HTTP Error” message while the upload progress bar read “Crunching…”. Thanks in part to the stunningly generic error message, it took a while to figure out exactly what was going on.  The problem, it turns out, was HTTP authentication; I had enabled Apache’s basic HTTP login for the site, but being a plugin, Adobe Flash was not similarly authenticated.  So, trying to use the Flash-based image uploader kept silently failing because it couldn’t authenticate with the server.  The fix is simple: just tell Apache not to use authentication for the script that handles Flash-based uploads.  You can do this by modifying the .htaccess file in the root of your WordPress directory like so:

<FilesMatch "(async-upload.php)$">
    Satisfy Any
    Order allow,deny
    Allow from all
    Deny from none
</FilesMatch>

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