Get the extensions associated with the given mime type. This should be
passed in lower case. There could be multiple extensions for a given mime
type, like "html,htm" for "text/html", or "txt,text,html,..." for "text/*".
Any existing elements in the provided vector will not be erased.
Get the extensions associated with the given mime type. This should be passed in lower case. There could be multiple extensions for a given mime type, like "html,htm" for "text/html", or "txt,text,html,..." for "text/*". Any existing elements in the provided vector will not be erased.