problems with jquery external rss feed integration

Your stand-alone file doesn’t know the WordPress constants and functions. Use the native WordPress AJAX API instead.

See also: What’s the preferred method of writing AJAX-enabled plugins?

In short: Put all your custom code into a function or a class and hook from your plugin into …

add_action('wp_ajax_ACTION_NAME', 'your_function');

… and …

add_action('wp_ajax_nopriv_ACTION_NAME', 'your_function');

Replace ACTION_NAME with something very unique.

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