class Protocol::HTTP::Headers

@returns [Hash] A hash table of `{key, value}` pairs.

Compute a hash table of headers, where the keys are normalized to lower case and the values are normalized according to the policy for that header.

def to_h
	@indexed ||= @fields.inject({}) do |hash, (key, value)|
		merge_into(hash, key.downcase, value)
		
		hash
	end
end