a_bit_of_rack.rb

# The media type parameters provided in CONTENT_TYPE as a Hash, or
# an empty Hash if no CONTENT_TYPE or media-type parameters were
# provided. e.g., when the CONTENT_TYPE is "text/plain;charset=utf-8",
# this method responds with the following Hash:
# { 'charset' => 'utf-8' }
def media_type_params
  return {} if content_type.nil?
  content_type.split(/\s*[;,]\s*/)[1..-1].
    collect { |s| s.split('=', 2) }.
    inject({}) { |hash,(k,v)| hash[k.downcase] = v ; hash }
end