server {
    listen      80;
    listen      [::]:80;
    server_name localhost;
    root        /workspace/;

    try_files $uri $uri/ /index.html;

    location /api/ {
        proxy_next_upstream http_502 http_504 error timeout invalid_header;

        proxy_pass http://$BACKEND_HOST;

        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 Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    # favicon.ico
    location = /favicon.ico {
        log_not_found off;
        access_log    off;
    }

    # robots.txt
    location = /robots.txt {
        log_not_found off;
        access_log    off;
    }

    # assets, media
    location ~* \.(?:css(\.map)?|js(\.map)?|jpe?g|png|gif|ico|cur|heic|webp|tiff?|mp3|m4a|aac|ogg|midi?|wav|mp4|mov|webm|mpe?g|avi|ogv|flv|wmv)$ {
        expires    7d;
        access_log off;
    }

    # svg, fonts
    location ~* \.(?:svgz?|ttf|ttc|otf|eot|woff2?)$ {
        add_header Access-Control-Allow-Origin "*";
        expires    7d;
        access_log off;
    }

    # gzip
    gzip            on;
    gzip_vary       on;
    gzip_proxied    any;
    gzip_comp_level 6;
    gzip_types      text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;
}