class MIME::Types

def type_for_extension ext

Return the first found content-type for a value considered as an extension or the value itself 
def type_for_extension ext
  candidates = @extension_index[ext]
  candidates.empty? ? ext : candidates[0].content_type
end

def type_for_extension ext 

def type_for_extension ext
  @__types__.type_for_extension ext
end