openresty - 为什么我不能设置多个cookie

Question

我正在尝试设置多个 cookie，但它不起作用：

if type(ngx.header["Set-Cookie"]) ~= "table" then
    ngx.header["Set-Cookie"] = {}
end
table.insert(ngx.header["Set-Cookie"], "Cookie1=abc; Path=/")
table.insert(ngx.header["Set-Cookie"], "Cookie2=def; Path=/")
table.insert(ngx.header["Set-Cookie"], "Cookie3=ghi; Path=/")

在客户端上，我没有收到任何 cookie。

Answer 1

ngx.header["Set-Cookie"]是一个特殊的表，每次修改它时都必须使用新表重新分配（插入或删除的元素对将发送到客户端的 cookie 没有影响）：

if type(ngx.header["Set-Cookie"]) == "table" then
    ngx.header["Set-Cookie"] = { "AnotherCookieValue=abc; Path=/", unpack(ngx.header["Set-Cookie"]) }
else
    ngx.header["Set-Cookie"] = { "AnotherCookieValue=abc; Path=/", ngx.header["Set-Cookie"] }
end

Answer 2

您可以使用https://github.com/cloudflare/lua-resty-cookie

local ck = require "resty.cookie"
local cookie, err = ck:new()
cookie:set({key = "Cookie1", value = "abc", path = "/"})
cookie:set({key = "Cookie2", value = "def", path = "/"})
cookie:set({key = "Cookie3", value = "ghi", path = "/"})