def write_preamble(code, headers = {})
			res.status = code
			@boundary = SecureRandom.uuid
			res["Content-Type"] = "multipart/mixed; boundary=\"#{@boundary}\""
			headers.each do |key, value|
				res[key] = value
			end
			ResponseHelpers.stats.incr_total_write_multipart
		end
def write_preamble(code, headers = {})
			res.status = code
			@boundary = SecureRandom.uuid
			res["Content-Type"] = "multipart/mixed; boundary=\"#{@boundary}\""
			headers.each do |key, value|
				res[key] = value
			end
			ResponseHelpers.stats.incr_total_write_multipart
		end
Multipart