Nginx Proxy Redirection Issue

I am new to using nginx. I am creating a homelab and trying to use this as reverse proxy

I have created this config

events {}

http {

    # Define MIME types
    include       /etc/nginx/mime.types;  # Ensure this file is included
    default_type  application/octet-stream;
    # Global settings to reduce redundancy
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;
    
    limit_req_zone $binary_remote_addr zone=one:10m rate=10r/s;

    # HTTP server block to redirect all HTTP requests to HTTPS
    server {
        listen 80;
        server_name _;  # Accepts all hosts

        # Redirect HTTP to HTTPS
        location / {
            return 301 https://$host$request_uri;
        }
    }

    # HTTPS server block for secure connections
    server {
        listen 443 ssl;
        server_name _;  # Accepts all hosts

        # SSL certificates for HTTPS
        ssl_certificate /etc/nginx/certs/fullchain.pem;
        ssl_certificate_key /etc/nginx/certs/privkey.pem;

        # Strong SSL settings for security
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers 'TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384';
        ssl_prefer_server_ciphers on;

        # Proxy configuration for each backend service (using separate location blocks)

        # Heimdall Service
        
        location /gity/ {
            proxy_pass http://127.0.0.1:85;
            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_redirect off;
        }

        location /heimdall {
            return 301 http://$host/;
        }

        location /portainer {
            return 301 https://$host:9443/;
        }

        location /deluge {
            return 301 http://$host:8112/;
        }

        location /excalidraw {
            return 301 http://$host:3005/;
        }

        location /ittools {
            return 301 http://$host:3080/;
        }

        location /jellyfin {
            return 301 http://$host:8096/;
        }

        location /speedtest {
            return 301 http://$host:3000/;
        }

        location /minio {
            return 301 http://$host:9002/;
        }

        location /downloader {
            return 301 http://$host:8113/;
        }

        location /bitwarden {
            return 301 https://$host:2000/;
        }

        location /discord {
            return 301 http://$host:3050/;
        }

        location /filebrowser {
            return 301 http://$host:8080/;
        }

        location /gitlab {
            return 301 http://$host:85/;
        }

        location /webmin {
            return 301 https://$host:10000/;
        }

        location /postgresdb {
            return 301 http://$host:5050/;
        }

        location /mongodb {
            return 301 http://$host:5051/;
        }

        location /sonarqube {
            return 301 http://$host:4000/;
        }
        
        location /yt-downloader {
            return 301 http://$host:8998/;
        }

        # Additional SSL configurations as needed
    }
}

I want to use url like https://maximus.local/gitlab and it should internally redirect all the requests to http://maximus.local:85.

I created a temp path /gity/ to test this but https://maximus.local/gity/ is redirecting to https://maximus.local/users/sign_in but it should be https://maximus.local/gity/users/sign_in