class Protocol::HTTP::Headers

def trailers!(&block)

Record the current headers, and prepare to receive trailers.
def trailers!(&block)
	return nil unless self.include?(TRAILERS)
	
	@tail ||= @fields.size
	
	return to_enum(:trailers!) unless block_given?
	
	if @tail
		@fields.drop(@tail).each(&block)
	end
end