Nginx cors by lua

cors.lua

local origin_pattern = [=[(\.hui\.lu|\.cloverstd\.com)(:\d+)?$]=]
local headers = ngx.req.get_headers()

ngx.header['Access-Control-Max-Age'] = '3600'
ngx.header['Access-Control-Allow-Credentials'] = 'true'

local origin = headers['Origin']
if origin then
    local m, err = ngx.re.match(origin, origin_pattern, "jo")
    if m then
        ngx.header['Access-Control-Allow-Origin'] = origin
    end
end

local request_headers = headers['Access-Control-Request-Headers']
if request_headers then
    ngx.header['Access-Control-Allow-Headers'] = request_headers
end

local request_method = headers['Access-Control-Request-Method']
if request_method then
    ngx.header['Access-Control-Allow-Methods'] = request_method
end

if ngx.req.get_method() == 'OPTIONS' then
    ngx.exit(204);
end