I'm trying to set touch icon. I successfully uploaded the image.

However, if I refresh the page, the field becomes empty.

And the icon show in "Add to Home Screen" is just a preview of the web page.

I am using nodebb with nginx, there is always an Not Found error after login, and login is successful.

The requested address become http://localhost/forum/http://localhost/forum, after login.

And there is a 404 error console:
GET http://localhost/forum/api/http://localhost/forum?_=1546743429781 404 (Not Found)

In config file of nginx:

server {
    listen 80;

    location /forum {
        proxy_pass http://localhost:4567/forum/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}

And in config.json:

{
    "url": "http://localhost:4567/forum/",
    "secret": "xxxxx-xxxxx-xxxx-xxx-xxxx",
    "database": "mongo",
    "port": "4567",
    "mongo": {
        "host": "127.0.0.1",
        "port": "27017",
    }
}