Event data an array of headers dokuwiki will send[1].
The default action is to output all the headers in order using the header() function.

This event is a full trigger, meaning there are three advises:
- SEND_HEADERS_before
- SEND_HEADERS
- SEND_HEADERS_after

Handlers of this event can add/modify/delete the headers in the event data. The event
data must remain an array, even if emptied.

[1] There is one dokuwiki header 'Content-Type: text/html; charset

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