openresty 获取 设置 cookie

来源：https://github.com/openresty/lua-nginx-module/issues/19

• To get cookie "Foo"

local cookie_value = ngx.var.cookie_Foo

或者

local cookie_name = "UID2"
local var_name = "cookie_" .. cookie_name
local cookie_value = ngx.var[var_name]

• To write a cookie Foo

ngx.header['Set-Cookie'] = 'Foo=abc; path=/'

• 设置多个 cookie 项

ngx.header["Set-Cookie"] = { cookie1, cookie2, cookie3 }

• 设置 cookie 超时时间

local expires = 3600 * 24  -- 1 day
ngx.header["Set-Cookie"] = "session=blah; Path=/; Expires=" .. ngx.cookie_time(ngx.time() + expires)