SSL: Don't attempt to send headers if already sent #1222
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dcde0c3 did this for formats/types, but not months and countries. That leads to a PHP notice when pentesters pass invalid input.
I haven't been able to reproduce the problem, but production is throwing notices for this on some HTTPS `wp-cron.php` URLs. `wp-cron.php` sends headers as one of the first things in the script, before loading WP. `is_ssl()` should be returning `true`, though, which would trigger the early return. Regardless, this change should fix it.
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This fixes a few PHP notices in the production logs