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With add_action, I want to intercept as early as I can in my plugin and send a 304 Not Modified header per some rules. Does anyone know what the order is of events? When I view this page, it seems to hint that the best place for this would be plugins_loaded, and that it comes before the init event. Is that correct? The page in that link doesn't describe what the event order is, but seems to imply it.

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up vote 6 down vote accepted

The page you referenced does have the correct order of events listed there. If you want to see which events were fired for a particular request you can install debug-bar and debug-bar-action-hooks.

If you are wanting to send a header either plugins_loaded or init will work. But it is recommended to use the send_headers action that is fired just after the request is parsed, also if your rules depend on data in WP_Query you will need to use send_headers.

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Hikari Hooks Troubleshooting is another excellent plugin for this. –  dunc May 3 '12 at 11:36
    
From what I can tell from this debug-bar plugin, the plugins_loaded event is the best place to run what I was trying to do -- it runs before init. –  Volomike May 3 '12 at 11:47
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