Nginx塞入多組cookie寫法
===

    # 介紹頁
    location / {
        root   "/home/cashier_intro/cashier_intro/cashier";
        index  index.html index.htm;


        set $utm_campaign_value "";
        set $gclid_value "";
        set $fbclid_value "";

        if ($arg_utm_campaign) {
            set $utm_campaign_value $arg_utm_campaign;
        }
        
        if ($arg_gclid) {
            set $gclid_value $arg_gclid;  
        }
        
        if ($arg_fbclid) {
            set $fbclid_value $arg_fbclid;  
        }
        ## 這樣寫是因為怕訪問同資料夾下面的js也會重複寫入cookie 
        ## 所以讓她只有訪問index.html的時候才設定
        if ($uri = "/index.html") {
            add_header Set-Cookie "utm_campaign=$utm_campaign_value" always;
            add_header Set-Cookie "fbclid=$fbclid_value" always;
            add_header Set-Cookie "gclid=$gclid_value" always;
        }
    }