Syncthing not working on a Raspberry PI behind an nginx reverse proxy

Include required information

• cat /etc/os-release

  PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
  NAME="Raspbian GNU/Linux"
  VERSION_ID="10"
  VERSION="10 (buster)"
  VERSION_CODENAME=buster
  ID=raspbian
  ID_LIKE=debian
  HOME_URL="http://www.raspbian.org/"
  SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
  BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"
  

• uname-r 5.10.17-v8+
• syncthing -version syncthing v1.14.0 "Fermium Flea" (go1.16 linux-arm) deb@build.syncthing.net 2021-02-26 12:21:13 UTC [noupgrade]
• Firefox 86

Nginx as reverse proxy

Because I have more services installed on the PI, I use Nginx as a reverse proxy.
This is the configuration

server {
        listen 80;
        listen [::]:80;
        server_name sync.thing;
        autoindex off;

        location / {
                allow 192.168.178.0/24;
                allow fd00::/32;
                expires max;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header X-Forwarded-Proto $scheme;
                proxy_set_header X-Forwarded-Port $server_port;
                proxy_set_header Host localhost;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_pass http://localhost:8384/;

                proxy_read_timeout 600s;
                proxy_send_timeout 600s;
                deny all;
        }

        location ~ \.php$ {
                deny all;
        }

        location ~ /\.ht {
                deny all;
        }
}

What happened?

• I’m able to access the url http://sync.thing/.
• It shows the expected page.
• I was able to setup a connection to an other Syncthing node.
• The choose folder was synced.
• Suddenly the display of all information disappeard.
• grafik1471×668 33.9 KB
• In the Devtools I see thousands of requests
• grafik1246×599 47.8 KB
• When I open http://sync.thing/ in a private Browser tab everything works fine
• But also in the private Browser tab there are thousands of requests to http://sync.thing/rest/events?since=19

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