Андрей Хохлов

server {
    listen 80;
    server_name _;
    root /home/user/www/example.com/public_html;
    index index.html;

    # example.com/foo// => example.com/foo/
    if ($request_uri ~ "^[^?]*?//") {
      rewrite "^" $scheme://$host$uri permanent;
    }

    # example.com/index.html => example.com/
    rewrite (?i)^(.*)index\.html$ $1/ permanent;

    # example.com/foo => example.com/foo/
    rewrite ^([^.]*[^/])$ $1/ permanent;

    # example.com/foo.html => example.com/foo/
    rewrite (?i)^(.*)/(.*)\.html $1/$2/ permanent;

    # prevent access from example.com/index/
    location ~ /index/ {
        return 404;
    }

    location / {
        # remove slash from url end for access .html files
        # example.com/foo/ => example.com/foo
        rewrite ^/(.*)/$ /$1 last;
        try_files $uri.html $uri $uri/index.html $uri/ =404;
    }
}