nginx react unsupported

Dockerfile

FROM nginx:alpine

ADD dist/ /usr/share/nginx/html
ADD /docker/nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

nginx.conf

map $http_user_agent $outdated {
    default                                  0;
    "~*MSIE [1-9]\."                         1;
    "~*Mozilla.*Firefox/[1-9]\."             1;
    "~*Mozilla.*Firefox/[0-2][0-9]\."        1;
    "~*Mozilla.*Firefox/3[0-1]\."            1;
    "~*Opera.*Version/[0-9]\."               1;
    "~*Opera.*Version/[0-1][0-9]\."          1;
    "~*Opera.*Version/2[0-1]\."              1;
    "~*AppleWebKit.*Version/[0-6]\..*Safari" 1;
    "~*Chrome/[0-9]\."                       1;
    "~*Chrome/[0-2][0-9]\."                  1;
    "~*Chrome/3[0-3]\."                      1;
}

server {
    listen       80;
    server_name  localhost;

    # Security Headers
    server_tokens off;
    add_header X-Frame-Options SAMEORIGIN;
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";

    # Optimization
    gzip on;
    gzip_disable "msie6";

    gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;

    root /usr/share/nginx/html;


    location ~ (?:.+\/)((?:.+)\.(?:.+)) {
      # $1 is the filename
      try_files $uri /$1 /css/$1 =404;
    }

    location / { 
      if ($outdated = 1){
          rewrite ^ /unsupported.html break;
      }
      try_files $uri /index.html;
    }
}