Nextcloud ISPConfig3 Debian Buster Nginx

In the PHP directives in ISPConfig3

upload_max_filesize=20g
post_max_size=20g
always_populate_raw_post_data=-1
max_execution_time = 3600

In ISPConfig3, insert the following in the nginx directives

# Add headers to serve security related headers
# Before enabling Strict-Transport-Security headers please read into this
# topic first.
#add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;" always;
#
# WARNING: Only add the preload option once you read about
# the consequences in https://hstspreload.org/. This option
# will add the domain to a hardcoded list that is shipped
# in all major browsers and getting removed from this list
# could take several months.
add_header Referrer-Policy "no-referrer" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Download-Options "noopen" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header X-Robots-Tag "none" always;
add_header X-XSS-Protection "1; mode=block" always;

# Remove X-Powered-By, which is an information leak
fastcgi_hide_header X-Powered-By;

# Path to the root of your installation
root {DOCROOT};

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

# The following 2 rules are only needed for the user_webfinger app.
# Uncomment it if you're planning to use this app.
#rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
#rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json last;

# The following rule is only needed for the Social app.
# Uncomment it if you're planning to use this app.
#rewrite ^/.well-known/webfinger /public.php?service=webfinger last;

location = /.well-known/carddav {
 return 301 $scheme://$host:$server_port/remote.php/dav;
}
location = /.well-known/caldav {
 return 301 $scheme://$host:$server_port/remote.php/dav;
}

# set max upload size
client_max_body_size 20G;
fastcgi_buffers 64 4K;

# Enable gzip but do not remove ETag headers
gzip on;
gzip_vary on;
gzip_comp_level 4;
gzip_min_length 256;
gzip_proxied expired no-cache no-store private no_last_modified no_etag auth;
gzip_types application/atom+xml application/javascript application/json application/ld+json application/manifest+json application/rss+xml application/vnd.geo+json application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/bmp image/svg+xml image/x-icon text/cache-manifest text/css text/plain text/vcard text/vnd.rim.location.xloc text/vtt text/x-component text/x-cross-domain-policy;

# Uncomment if your server is build with the ngx_pagespeed module
# This module is currently not supported.
#pagespeed off;

location / {
   rewrite ^ /index.php;
}

#location ~ ^\/(?:build|tests|config|lib|3rdparty|templates|data)\/ {
location ~ ^\/(?:build|tests|config|lib|3rdparty|templates)\/ {
   deny all;
}
location ~ ^\/(?:\.|autotest|occ|issue|indie|db_|console) {
   deny all;
}

location ~ ^\/(?:index|remote|public|cron|core\/ajax\/update|status|ocs\/v[12]|updater\/.+|oc[ms]-provider\/.+|.+\/richdocumentscode\/proxy)\.php(?:$|\/) {
   fastcgi_split_path_info ^(.+?\.php)(\/.*|)$;
   set $path_info $fastcgi_path_info;
   try_files $fastcgi_script_name =404;
   include fastcgi_params;
   fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
   fastcgi_param PATH_INFO $path_info;
   fastcgi_param HTTPS on;
   # Avoid sending the security headers twice
   fastcgi_param modHeadersAvailable true;
   # Enable pretty urls
   fastcgi_param front_controller_active true;
   fastcgi_pass php-handler;
   fastcgi_intercept_errors on;
   fastcgi_request_buffering off;
}

location ~ ^\/(?:updater|oc[ms]-provider)(?:$|\/) {
   try_files $uri/ =404;
   index index.php;
}

# Adding the cache control header for js, css and map files
# Make sure it is BELOW the PHP block
location ~ \.(?:css|js|woff2?|svg|gif|map)$ {
   try_files $uri /index.php$request_uri;
   add_header Cache-Control "public, max-age=15778463";
   # Add headers to serve security related headers (It is intended to
   # have those duplicated to the ones above)
   # Before enabling Strict-Transport-Security headers please read into
   # this topic first.
   #add_header Strict-Transport-Security "max-age=15768000; includeSubDomains; preload;" always;
   #
   # WARNING: Only add the preload option once you read about
   # the consequences in https://hstspreload.org/. This option
   # will add the domain to a hardcoded list that is shipped
   # in all major browsers and getting removed from this list
   # could take several months.
   add_header Referrer-Policy "no-referrer" always;
   add_header X-Content-Type-Options "nosniff" always;
   add_header X-Download-Options "noopen" always;
   add_header X-Frame-Options "SAMEORIGIN" always;
   add_header X-Permitted-Cross-Domain-Policies "none" always;
   add_header X-Robots-Tag "none" always;
   add_header X-XSS-Protection "1; mode=block" always;

   # Optional: Don't log access to assets
   access_log off;
}

location ~ \.(?:png|html|ttf|ico|jpg|jpeg|bcmap|mp4|webm)$ {
   try_files $uri /index.php$request_uri;
   # Optional: Don't log access to other assets
   access_log off;
}