[HttpFoundation] Use lowercase utf-8 as default response charset #60685
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nicolas-grekas
approved these changes
Jun 6, 2025
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Per the recommendations I found on https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Type#media-type and https://www.rfc-editor.org/rfc/rfc9110.html#section-8.3.1, it seems that using the lowercase variant is considered to be preferable.
An alternative approach would be to actually convert any charset argument to lowercase, which I would also be willing to implement if preferable. However, this is slightly more invasive, although it should function practically equivalent on any (modern) browser.