server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    client_max_body_size 50m;

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;

    # Docker DNS, so a recreated backend container is picked up without an nginx reload.
    resolver 127.0.0.11 valid=30s ipv6=off;

    location /api/ {
        set $backend_upstream backend:5670;
        proxy_pass http://$backend_upstream$request_uri;
        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;
        # Variable proxy_pass plus keepalive reuses a socket that is still
        # writing SSE. The next chat is written onto that socket and both die.
        proxy_set_header Connection "close";
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
    }

    location /files/ {
        set $backend_upstream backend:5670;
        proxy_pass http://$backend_upstream$request_uri;
        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_buffering off;
        proxy_read_timeout 3600s;
    }

    location /images/ {
        set $backend_upstream backend:5670;
        proxy_pass http://$backend_upstream$request_uri;
        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_buffering off;
    }

    location /health/ {
        set $backend_upstream backend:5670;
        proxy_pass http://$backend_upstream$request_uri;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
    }

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