class Mechanize
  class Headers < Hash
    def [](key)
      super(key.downcase)
    end

    def []=(key, value)
      super(key.downcase, value)
    end

    def key?(key)
      super(key.downcase)
    end

    def canonical_each
      block_given? or return enum_for(__method__)
      each { |key, value|
        key = key.capitalize
        key.gsub!(/-([a-z])/) { "-#{$1.upcase}" }
        yield [key, value]
      }
    end
  end
end