[Plugin: FlexiCache] Images broken on Standalone cached pages

Hi there,

Thanks for the feedback.

It looks like I might just be able to add an exception to the standalone .htaccess rules which exclude any URLs beginning with “/files/” from being intercepted, but I’ll do a bit of reading and testing to see what other issues there might be.

I’ll post here again when I’ve got a solution!

Si.

I tried adding the standard multisite line into the standalone .htaccess –

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

and it worked, but my understanding is that when ms-files.php is invoked it loads up WordPress with all of the associated overhead. Kind of defeats the purpose, since every page has some image component. It did seem to be slower, too.

For what it’s worth, WP Super Cache handles it without rewriting, but I don’t know how. The cached pages still have the short /files/ url. I haven’t scoured the code to see what’s going on, but it’s not supposed to be loading any pieces of WordPress when it’s in mod_rewrite mode. Here’s the addition to .htacces that it writes:

# BEGIN WPSuperCache
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
AddDefaultCharset UTF-8
RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} !.*=.*
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteCond %{DOCUMENT_ROOT}/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html.gz -f
RewriteRule ^(.*) “/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html.gz” [L]

RewriteCond %{REQUEST_METHOD} !POST
RewriteCond %{QUERY_STRING} !.*=.*
RewriteCond %{HTTP:Cookie} !^.*(comment_author_|wordpress_logged_in|wp-postpass_).*$
RewriteCond %{HTTP:X-Wap-Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{HTTP:Profile} !^[a-z0-9\”]+ [NC]
RewriteCond %{DOCUMENT_ROOT}/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html -f
RewriteRule ^(.*) “/wp-content/cache/supercache/%{HTTP_HOST}/$1/index.html” [L]
</IfModule>

# END WPSuperCache

Regards

Thanks for the update. I haven’t looked at the multisite stuff much since WordPress MU – that ms-files.php process looks like a really inefficient way of serving static files.

WP Super Cache and FlexiCache work very differently and I can see how in this particular situation WP Super Cache handles it without modification.

What I would suggest trying as a temporary workaround for your own site is to remove the additional RewriteRule you added above, and instead add the following at the top of your .htaccess file:

# BEGIN Temp Multisite Workaround
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} www\.mapped_domain\.com$
RewriteRule ^files/(.+)$ /wp-content/blogs.dir/2/files/$1 [L]
</IfModule>
# END Temp Multisite Workaround

Note that I have written this to match your original example, so you will need to edit the domain name and paths appropriately. This should do the same as ms-files.php is doing, but without using any PHP.

Please note that although I have tested the rules above locally, it’s not been tested thoroughly as I would with a plugin release, so you should consider it a temporary and experimental work-around only!

Si.

Yeah, I thought about doing it that way. I wonder how speedy that method is on a multisite with a lot of sites. Perhaps running through a stack of rewrite conditions in an .htaccess file, one for each mapped domain, would actually turn out to be the fastest way to do it. Then you’d have to get your plugin to add the rewrite rules into the .htaccess file for each mapped domain that it found.

Regards