【时好时坏】uidsuffix，新id第一次访问500，后面再刷新就正常

[yongdi]

2018/10/29 11:16:50 [error] 15232#0: *1462 [lua] utils.lua:32: dolog(): errcode : 200, errinfo : success redirect to upstream http://, client: 172...36, server: api-test.....com, request: "GET /1.0/phone/learn_more?uid=1003217&sig=77c2dd4c4eb5c8029ae795b6e473f89d%20HTTP/1.1 HTTP/1.1", host: "10....8"

比如这种，redirect to upstream http:// 啥也没有。
我用的是单层分流版本，就是uidsuffix，很简单的策略。

当用一个新uid的时候，错误必现，redirect为空，nginx返回500

配置如下：
————————————————
`upstream tiny-stable {
server 10....30:21110 max_fails=3 fail_timeout=30s;
server 10...31:21110 max_fails=3 fail_timeout=30s;
}
upstream beta {
server 10.....86:21110 max_fails=3 fail_timeout=30s;
}
...

location /xxx/ {
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header Host $host;
    real_ip_header X-Real-IP;
#    proxy_set_header Connection "";
#    proxy_http_version 1.1;


    rewrite /xxx/(.+)$ /$1 break;

    set $backend $default_backend;
    rewrite_by_lua_file '../diversion/diversion.lua';

    proxy_pass http://$backend;
}

`

[Toifyx]

你好，你的backend 应该是没有设置默认值。导致upstream是空