Nginx proxy returns blank page

[julianoBRL]

Describe the bug

I'm using a nginx as a reverse proxy for my applications and when tring to route it-tools the favcon returns fine que the page is totaly blank.

What happened?

I'm using a nginx as a reverse proxy for my applications and when tring to route it-tools the favcon returns fine que the page is totaly blank.

System information

it-tools logs:
172.18.0.4 - - [18/Dec/2024:14:54:32 +0000] "GET / HTTP/1.1" 200 2787 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36" ""

172.18.0.4 - - [18/Dec/2024:14:54:33 +0000] "GET /favicon.ico HTTP/1.1" 200 15086 "http:///ittools/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36" ""

nginx location config:
listen 80;
listen [::]:80;
location /ittools/ {
proxy_pass http://ittools:80/;
proxy_http_version 1.1;
proxy_set_header Host $host; # Forwarded host
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_redirect off;
}

docker network config:
name: proxy network {gateway: 172.35.0.1}
nginx: 172.35.0.3
ittools: 172.35.0.4

tried curl on the nginx container and it can see http://itools:80 fine. (also returns body empty)

requesting on /ittools
return:

Where did you encounter the bug?

A self hosted