How can i avoid google index my site properly jail directory only allow html extension

Server NGINX
1

Hello
I have small pdf search site searches pdf over internet when somebody
search
URL look like www.mypdfsearchwebsite.com/pdf/nginx.html with (html
extension)

google index this address with html and without html version so there
are
duplicate record on google index each search lies without html
www.mypdfsearchwebsite.com/pdf/nginx and with html
www.mypdfsearchwebsite.com/pdf/nginx.html version

what i would like to do is if i can make it around without html version
(www.mypdfsearchwebsite.com/pdf/nginx) will be returned 404 page rather
than
200 it could be also jail /pdf/ directory only allow html if html
couldn’t
find go to nginx 404 page.

I am not nginx guru but the newbie if you send me exactly location where
i
put suggested code i would be highly appreciated

thank you very much for your help

my nginx conf is below

server {
listen 1.2.3.4:80;

     server_name mypdfwebsite.com www.mypdfwebsite.com;

     # log_format  awstatcomp  '$host $remote_addr - $remote_user

[$time_local] “$request” ’ '$status $body_bytes_sent "$$

   #  access_log /var/log/nginx/mypdfwebsite.com.access.log main;
    access_log /var/log/nginx/mypdfwebsite.com.access.log

awstatcomp;
error_log /var/log/nginx/mypdfwebsite.com.error.log;
root /home/mypdfwebsite/www;
index index.php index.html;

    location / {
            try_files $uri $uri/ /index.php?q=$request_uri;
    }

 location ~ \.php$ {
         #root html;
         fastcgi_pass 127.0.0.1:9000;
         fastcgi_index index.php;
         fastcgi_param SCRIPT_FILENAME

/home/mypdfwebsite/www$fastcgi_script_name;
include fastcgi_params;
}

     location ~ /\. { deny all; }

    location ~ \.pl$ {
      gzip off;
      include /etc/nginx/fastcgi_params;
      #fastcgi_pass unix:/tmp/php.sock;
      #statistic perl
      fastcgi_pass  127.0.0.1:8999;
      fastcgi_index index.pl;
      fastcgi_param  SCRIPT_FILENAME

/home/mypdfwebsite/www/$fastcgi_script_name;
allow 127.0.0.1;
allow 1.2.3.34;
deny all;
}

}

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