近来几天发现访问博客端文章间歇性报出 502，一开始以为是 solo 博客端的配置问题，纠正排查后发现不是博客后台设置的问题。后来查看 nginx 的日志。发现如下报错：
邯城往事
2019/10/20 20:05:09 [error] 8539#0: *67 no live upstreams while connecting to upstream, client: 111.194.50.93, server: cjzshilong.cn, request: "GET /sw.js HTTP/1.1", upstream: "http://localhost/sw.js", host: "www.cjzshilong.cn", referrer: "https://www.cjzshilong.cn/sw.js"
2019/10/20 20:08:53 [notice] 8638#0: signal process started
2019/10/20 20:09:11 [error] 8659#0: *2 upstream sent too big header while reading response header from upstream, client: 111.194.50.93, server: cjzshilong.cn, request: "GET /articles/2019/10/15/1571128802984.html?pjax=true HTTP/1.1", upstream: "http://127.0.0.1:8080/articles/2019/10/15/1571128802984.html?pjax=true", host: "www.cjzshilong.cn", referrer: "https://www.cjzshilong.cn/?utm_source=hacpai.com"
通过参考各种网上资料，综合解决方法：
HTTP 和 HTTPS 下的配置，增加
proxy_buffer_size 128k;
proxy_buffers 32 32k;
proxy_busy_buffers_size 128k;
完整配置
location / {
proxy_pass http://backend$request_uri;
proxy_set_header Host $host:$server_port;
proxy_set_header Connection "Keep-Alive";
proxy_set_header X-Real-IP $remote_addr;
client_max_body_size 10m;
proxy_buffer_size 128k;
proxy_buffers 32 32k;
proxy_busy_buffers_size 128k;
}
参考链接