Unable to login when using nginx reverse proxy

[yhsiao]

*️⃣ Must open one ticket per issue. If you are experiencing multiple issues don't hesitate to create multiple tickets for each issue.

▶ Reproduction steps

1. origin website：a.example.com, reverse proxy website：b.example.com
2. nginx conf：
3. 
   #PROXY-START/
   
   location /
   {
   proxy_pass https://a.example.com😛ort;
   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 REMOTE-HOST $remote_addr;
   proxy_set_header Upgrade $http_upgrade;
   proxy_set_header Connection $connection_upgrade;
   proxy_http_version 1.1;
   # proxy_hide_header Upgrade;
   
   add_header X-Cache $upstream_cache_status;
   
   #Set Nginx Cache
   
   proxy_set_header Accept-Encoding "";
   sub_filter "a.example.com😛ort" "https://b.example.com😛ort";
   sub_filter_once off;
   
   set $static_fileYNxzz31H 0;
   if ( $uri ~* "\.(gif|png|jpg|css|js|woff|woff2)$" )
   {
   set $static_fileYNxzz31H 1;
   expires 1m;
   }
   if ( $static_fileYNxzz31H = 0 )
   {
   add_header Cache-Control no-cache;
   }
   }
   
   #PROXY-END/
4. [Example: Go to /upload and upload a X image]

😢 Unexpected result

User can not login

📃 Error log message

User can not login