class Protocol::HTTP::Headers::Merged

def each(&block)

@yields [String, String] header key (lower case string) and value (as string). 
def each(&block)
	return to_enum unless block_given?
	
	@all.each do |headers|
		headers.each do |key, value|
			yield key.to_s.downcase, value.to_s
		end
	end
end