This method is deprecated or moved on the latest stable version.
The last existing version (v2_2_9) is shown here.
sub_type()
public
Returns a content type string such as “html”. This method returns nil
if Content-Type: header field does not exist or sub-type is not given (e.g.
“Content-Type: text”).
# File lib/net/http/header.rb, line 323
def sub_type
return nil unless @header['content-type']
_, sub = *self['Content-Type'].split(';').first.to_s.split('/')
return nil unless sub
sub.strip
end