nginx.conf

server {
  listen 80;
  server_name arasaac.org;
  root /usr/share/nginx/html;
  index index.html;

  # location / {
  #   root /usr/share/nginx/html;
  #   try_files $uri /index.html;
  # }

  location / {
    try_files $uri @prerender;
  }

  location @prerender {
    # proxy_set_header X-Prerender-Token YOUR_TOKEN;

    set $prerender 0;
    if ($http_user_agent ~* "googlebot|bingbot|yandex|baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest\/0\.|pinterestbot|slackbot|vkShare|W3C_Validator|whatsapp") {
      set $prerender 1;
    }
    if ($args ~ "_escaped_fragment_") {
      set $prerender 1;
    }
    if ($http_user_agent ~ "Prerender") {
      set $prerender 0;
    }
    if ($uri ~* "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff|svg|eot)") {
      set $prerender 0;
    }

    #resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
    resolver 8.8.8.8 ipv6=off;

    if ($prerender = 1) {
      #setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing
      set $prerender "prerenderapp.arasaac.org";
      # return 200 'location 1';
      rewrite .* /$scheme://$host$request_uri? break;
      proxy_pass https://$prerender;
    }
    if ($prerender = 0) {
      # return 200 'location 2';
      rewrite .* /index.html break;
    }
  }


  # Do not cache sw.js, required for offline-first updates.
  location /sw.js {
    add_header Cache-Control "no-cache";
    proxy_cache_bypass $http_pragma;
    proxy_cache_revalidate on;
    expires off;
    access_log off;
  }


  location ~ ^/(api|zona_descargas|repositorio|catalogos.php|herramientas.php) {
    rewrite ^/(.*)$ http://old.arasaac.org/$1 permanent;
  }

  location /ejemplos_uso.php {
    rewrite ^/(.*)$ http://aulaabierta.arasaac.org/ejemplos-de-uso-caa permanent;
  }

  location /software.php {
    rewrite ^/(.*)$ http://aulaabierta.arasaac.org/software permanent;
  }

  location /premios.php {
    rewrite ^/(.*)$ /prizes permanent;
  }


  location /condiciones_uso.php {
    rewrite ^/(.*)$ http://arasaac.org/terms-of-use permanent;
  }

  location /contacta.php {
    rewrite ^/(.*)$ http://arasaac.org/contact-us permanent;
  }

  location /aac.php {
    rewrite ^/(.*)$ http://arasaac.org/aac permanent;
  }

  location ~ ^/(pictogramas_color.php|pictogramas_byn.php) {
    rewrite ^/(.*)$ http://arasaac.org/pictograms/search? permanent;
  }


  location ~ ^/(videos_lse.php|signos_lse_color.php) {
    rewrite ^/(.*)$ http://arasaac.org/lse? permanent;
  }

  # location = /materiales.php {
  #     rewrite ^/(.*)$ /materials/search? permanent;
  # }

  location ~ /materiales.php {
    if ($args ~* "(.*)(id_material=)(.*)") {
      set $id $3;
      set $args '';
      return 301 /materials/es/$id?;
    }
    rewrite ^/(.*)$ /materials/search? permanent;
  }


  #error_page  404              /404.html;
  # redirect server error pages to the static page /50x.html
  #
  error_page 500 502 503 504 /50x.html;
  location = /50x.html {
    root /usr/share/nginx/html;
  }

}

server {
  listen 80;
  server_name www.arasaac.org arasaac.es www.arasaac.es;
  # $scheme will get the http protocol
  # and 301 is best practice for tablet, phone, desktop and seo
  return 301 $scheme://arasaac.org$request_uri;
}