[Content]: Note Content-Type inference for template extensions

[AugustMiller]

Product

Craft CMS

Description

When you create a template file like my-ajax-handler.json.twig, Craft will automatically send a Content-Type: application/json header. No need for {% header ... %} tags in the template—just echo out the JSON!

This should work for any MIME type detectable via craft\helpers\FileHelper::getMimeTypeByExtension($template)—but please don't try and "render" an MP3 in Twig. :)