upstream backend_upstream {
    server backend:8000;
    keepalive 16;
}

server {
    listen 80;
    server_name _;

    server_tokens off;
    etag off;

    root /usr/share/nginx/html;
    index index.html;

    #gzip on;
    #gzip_comp_level 5;
    #gzip_min_length 1024;
    #gzip_types text/plain text/css text/javascript application/javascript application/json application/xml image/svg+xml;

    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;

    proxy_http_version 1.1;
    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_set_header Connection "";
    proxy_buffering off;
    proxy_read_timeout 60s;
    proxy_send_timeout 60s;

    location ^~ /assets/ {
        expires 7d;
        add_header Cache-Control "public, max-age=604800, immutable" always;
        try_files $uri =404;
    }

    location = /favicon.ico {
        expires 7d;
        add_header Cache-Control "public, max-age=604800" always;
        try_files $uri =404;
    }

    location = /index.html {
        expires -1;
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
        try_files $uri =404;
    }

    location ^~ /api/ {
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
        add_header Pragma "no-cache" always;
        proxy_pass http://backend_upstream/api/;
    }

    location = /docs {
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
        proxy_pass http://backend_upstream/docs;
    }

    location = /openapi.json {
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
        proxy_pass http://backend_upstream/openapi.json;
    }

    location = /redoc {
        add_header Cache-Control "no-store, no-cache, must-revalidate" always;
        proxy_pass http://backend_upstream/redoc;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }
}