enum HttpHeader {
	user_agent
	referer
}

headers := {
	HttpHeader.user_agent: 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36' // content_length: '17' // <-- will be deleted
	.referer:              'wwww.google.com' // content_length: '17' // <-- won't be deleted
}