http: Fix encoding issue in raw file handler
Turns out "content-type: text; charset=utf-8" wasn't valid, it had to be "content-type: text/plain; charset=utf-8" for browsers to recognise it properly.
Turns out "content-type: text; charset=utf-8" wasn't valid, it had to be "content-type: text/plain; charset=utf-8" for browsers to recognise it properly.
