Я не могу настроить сервер Nginx так, чтобы:

public_html/frontend/web/index.php файл будет отправлен в ответ на запрос «index.php».public_html/backend/web/index.php файл будет отправлен в ответ на запрос «admin / index.php».

Посоветуйте пожалуйста где я не прав. Вот мой конфиг:

server {
    listen        80;
    server_name   yii2.lo;
    server_tokens off;

    client_max_body_size 128M;
    charset       utf-8;

    access_log    /var/log/nginx/yii2-access.log main buffer=50k;
    error_log     /var/log/nginx/yii2-error.log notice;

    set           $host_path      "/srv/http/yii2/public";
    set           $yii_bootstrap  "index.php";

    index         $yii_bootstrap;

    location / {
        root          $host_path/frontend/web;
        try_files $uri $uri/ /$yii_bootstrap?$args;

    }

    location /admin {
        root          $host_path/backend/web;
        try_files $uri $uri/ /$yii_bootstrap?$args;
    }

    location ~ \.php$ {
        try_files $uri =404;

        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_index           $yii_bootstrap;

        # Connect to php-fpm via socket
        fastcgi_pass unix:/run/php-fpm/php-fpm.sock;

        fastcgi_connect_timeout     30s;
        fastcgi_read_timeout        30s;
        fastcgi_send_timeout        60s;
        fastcgi_ignore_client_abort on;
        fastcgi_pass_header         "X-Accel-Expires";

        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        fastcgi_param  PATH_INFO        $fastcgi_path_info;
        fastcgi_param  HTTP_REFERER     $http_referer;
        include fastcgi_params;
    }

    location ~* \.(js|css|less|png|jpg|jpeg|gif|ico|woff|ttf|svg|tpl)$ {
        expires 24h;
        access_log off;
    }

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

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

    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
}