正常使用后，再访问一些网站的502报错问题

[Chandler-Lu]

环境

代码版本：de47a99f4f5386c5c6652ef929412d4b91b3f719
地区：美国（IP 干净）
使用方法：源码部署+ NginX 反代

复现

1. 访问 https://example.com/password ，自动跳转到 https://example.com/PASSWORD/https/www.netptop.com
2. 从主页访问 Bing，返回 502

但如果开一个隐身窗口，直接访问 https://example.com/PASSWORD/https/www.bing.com ，则 Bing 访问正常，此时退回 ttps://example.com/PASSWORD/ 主页访问 Google 等页面则不正常

NginX 日志：
IP - - [07/Aug/2024:16:55:07 +0800] "GET /PASSWORD/https/www.bing.com HTTP/2.0" 502 552 "https://example.com/PASSWORD/https/www.netptop.com" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36"

另一些问题

正常访问 A 网站后再访问 B 网站（暂时没能稳定复现，不太确定具体是哪些网站），会返回 502，此时再访问别的网站也都会 502。清除 Cookie 后问题解决，怀疑与 proxy_real_host 有关。

例如当我访问完 Bing 再访问 Google 时，后台收到的请求是：
"GET /PASSWORD/https/www.google.com HTTP/2.0" 502 552 "https://example.com/siteproxy_service_worker.js?proxy_real_protocol=https&proxy_real_host=www.bing.com" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36"

NginX 配置：

server {
  listen 443 ssl;
  listen [::]:443 ssl;
  http2 on;

  ssl_certificate ;
  ssl_certificate_key ;

  server_name example.com;

  add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

  location / {
    proxy_pass http://127.0.0.1:8002;
    proxy_http_version	1.1;
    proxy_cache_bypass	$http_upgrade;
    proxy_set_header Upgrade		    $http_upgrade;
    proxy_set_header Connection 		"upgrade";
    proxy_set_header Host			    $host;
    proxy_set_header X-Real-IP		    $remote_addr;
    proxy_set_header X-Forwarded-For	$proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto	$scheme;
    proxy_set_header X-Forwarded-Host	$host;
    proxy_set_header X-Forwarded-Port	$server_port;
  }
}

[Chandler-Lu]

我傻了……就是忘了看 error log……

upstream sent too big header while reading response header from upstream

 proxy_buffer_size 128k;
 proxy_buffers 32 32k;
 proxy_busy_buffers_size 128k;