Nginx downloads PHP instead of executing it - php

Question

I want to make certain php files accessible via http only.
So I added location = /example.php{} as shown in the code below.
server {
listen 80;
ssl off;
server_name example.com www.example.com;
root /var/www/example;
location ~* \.(php)$ {
# dostufdd
}
location = /example.php {
#do stuff
}
location / {
return 301 https://$host$request_uri;
}
}
server {
listen 443 ssl http2;
server {
listen 443 ssl http2;
server_name example.com www.example.com;
root /var/www/example;
index index.php;
ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/example.com/chain.pem;
ssl_dhparam /etc/letsencrypt/live/example.com/example.com.dhparam;
ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4;
# Set caches, protocols, and accepted ciphers. This config will
# merit an A+ SSL Labs score.
ssl_session_cache shared:SSL:20m;
ssl_session_timeout 10m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kED$
error_log /var/log/nginx/example.error.log warn;
location / {
try_files $uri $uri/ /index.php?$args;
}
# Allow Lets Encrypt Domain Validation Program
location ^~ /.well-known/acme-challenge/ {
allow all;
}
# Block dot file (.htaccess .htpasswd .svn .git .env and so on.)
location ~ /\. {
deny all;
}
# Block (log file, binary, certificate, shell script, sql dump file) access.
location ~* \.(log|binary|pem|enc|crt|conf|cnf|sql|sh|key)$ {
deny all;
}
location = /robots.txt {
log_not_found off;
access_log off;
}
location = /favicon.ico {
log_not_found off;
access_log off;
}
location ~* \.(css|js|ico|gif|jpe?g|png|svg|eot|otf|woff|woff2|ttf|ogg)$ {
expires max;
}
location ~ /.well-known {
allow all;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/run/php/php7.0-fpm.sock;
fastcgi_index index.php;
fastcgi_read_timeout 180;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}
However, if I try to access to http://example.com/example.php, the php file is
downloaded instead of executing.
but If i access https://example.com/example.php, it will be accessed normally.
I have no idea what to do.
Please help me.
Thank you.