nginx-mempool.conf

  map $http_accept_language $header_lang {
    default en-US;
    ~*^en-US en-US;
    ~*^en en-US;
          ~*^ar ar;
          ~*^cs cs;
          ~*^de de;
          ~*^es es;
          ~*^fa fa;
          ~*^fr fr;
          ~*^ko ko;
          ~*^it it;
          ~*^ka ka;
          ~*^hu hu;
          ~*^nl nl;
          ~*^ja ja;
          ~*^nb nb;
          ~*^pt pt;
          ~*^sl sl;
          ~*^fi fi;
          ~*^sv sv;
          ~*^tr tr;
          ~*^uk uk;
          ~*^vi vi;
          ~*^zh zh;
  }

  map $cookie_lang $lang {
    default $header_lang;
    ~*^en-US en-US;
    ~*^en en-US;
          ~*^ar ar;
          ~*^cs cs;
          ~*^de de;
          ~*^es es;
          ~*^fa fa;
          ~*^fr fr;
          ~*^ko ko;
          ~*^it it;
          ~*^ka ka;
          ~*^hu hu;
          ~*^nl nl;
          ~*^ja ja;
          ~*^nb nb;
          ~*^pt pt;
          ~*^sl sl;
          ~*^fi fi;
          ~*^sv sv;
          ~*^tr tr;
          ~*^uk uk;
          ~*^vi vi;
          ~*^zh zh;
  }

server {
  listen *:4000;
  access_log /var/log/nginx/access_mempool.log;
  error_log /var/log/nginx/error_mempool.log;

  root /home/bitcoin/mempool/frontend/dist/mempool/browser;

  index index.html;

  # fallback for all URLs i.e. /address/foo /tx/foo /block/000
  location / {
    try_files /$lang/$uri /$lang/$uri/ $uri $uri/ /en-US/$uri @index-redirect;
  }
  location @index-redirect {
    add_header vary accept-language;
    rewrite (.*) /$lang/index.html;
  }

  # location block using regex are matched in order

  # used to rewrite resources from /<lang>/ to /en-US/
  location ~ ^/(ar|bg|bs|ca|cs|da|de|et|el|es|eo|eu|fa|fr|gl|ko|hr|id|it|he|ka|lv|lt|hu|mk|ms|nl|ja|ka|no|nb|nn|pl|pt|pt-BR|ro|ru|sk|sl|sr|sh|fi|sv|th|tr|uk|vi|zh)/resources/ {
    rewrite ^/[a-zA-Z-]*/resources/(.*) /en-US/resources/$1;
  }
  # used for cookie override
  location ~ ^/(ar|bg|bs|ca|cs|da|de|et|el|es|eo|eu|fa|fr|gl|ko|hr|id|it|he|ka|lv|lt|hu|mk|ms|nl|ja|ka|no|nb|nn|pl|pt|pt-BR|ro|ru|sk|sl|sr|sh|fi|sv|th|tr|uk|vi|zh)/ {
    try_files $uri $uri/ /$1/index.html =404;
  }

  # static API docs
  location = /api {
    try_files $uri $uri/ /en-US/index.html =404;
  }
  location = /api/ {
    try_files $uri $uri/ /en-US/index.html =404;
  }

  # mainnet API
  location /api/v1/donations {
    proxy_pass https://mempool.space;
  }
  location /api/v1/donations/images {
    proxy_pass https://mempool.space;
  }
  location /api/v1/ws {
    proxy_pass http://127.0.0.1:8999/;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  }
  location /api/v1 {
    proxy_pass http://127.0.0.1:8999/api/v1;
  }
  location /api/ {
    proxy_pass http://127.0.0.1:8999/api/v1/;
  }

  # mainnet API
  location /ws {
    proxy_pass http://127.0.0.1:8999/;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  }
}