for k, v in pairs(ngx.req.get_headers()) do
    ngx.say(k, ": ", v,"<br/>")
end

accept-language: zh-CN,zh;q=0.8,en;q=0.6
connection: keep-alive
accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
cache-control: max-age=0
host: xxcupid2.qunar.com
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accept-encoding: gzip, deflate, sdch
upgrade-insecure-requests: 1
user-agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36