Seems like a simple problem, but I can’t find an answer.
With cacheing disabled, everything works fine.
With cacheing enabled the following javascript include returns a WordPress ‘page unfound’ error.
http://myserver/wp-content/plugins/myplugin/js/jquery.cycle.all.min.js
I’m disabling the cache using the Firefox web developer tool, but I can’t see that that should have any bearing in the issue. For some reason, WordPress can’t find a legit file.
The script is properly registered and queued with the following code:
wp_register_script("jquery.cycle.all.min.js", $plugin_url . '/js/jquery.cycle.all.min.js', 'jquery');
wp_enqueue_script("jquery.cycle.all.min.js");
Clear browser cache. (dur … I know).
Unexpected behaviour when switching browser cache on and off, with files that were kept in the cache for a long time.
Does turning your cache back on make the problem come back? If not, then it was a problem with your browser’s cache, not the server. If the problem does return then you should look at the headers, as Samuel Edwin Ward mentioned.