Safer WordPress with these .htaccess additions

.htaccess

# Don't show errors which contain full path diclosure (FPD)
# Use that line only if PHP is installed as a module and not per CGI
# try using a php.ini in that case.
# Change mod_php5.c to mod_php7.c if you are running PHP7
<IfModule mod_php5.c>
  php_flag display_errors Off
</IfModule>

# Don't list directories
<IfModule mod_autoindex.c>
  Options -Indexes
</IfModule>

# PROTECT install.php
# Uncomment or change to 'Allow from all' for install of WordPress
<Files install.php>
  Order Allow,Deny
  Deny from all
  Satisfy all
</Files>

# Protect XMLRPC (needed for Apps, Offline-Blogging-Tools, Pingback, etc.)
# If you use that, these tools will not work anymore
<Files xmlrpc.php>
  Order Deny,Allow
  Deny from all
</Files>

# If you don't use the Database Optimizing and Post-by-Email features, turn off the access too:
<FilesMatch "(repair|wp-mail)\.php">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Prevent browser and search engines to request .log (e.g. WP DEBUG LOG) and .txt (e.g. plugins readme) files. 
# Must be placed in /wp-content/.htaccess
<FilesMatch "\.(log|txt)$">
    Order Allow,Deny
    Deny from all
</FilesMatch>

# Hide WordPress, system & sensitive files
<FilesMatch "(^\.|wp-config(-sample)*\.php)">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Protect some other files
<FilesMatch "(liesmich.html|readme.html|license.txt|(.*)\.bak)">
  Order Deny,Allow
  Deny from all
</FilesMatch>

# Block the include-only files.
# Do not use in Multisite without reading the note in Codex!
# See: https://wordpress.org/support/article/hardening-wordpress/#securing-wp-includes
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /
  RewriteRule ^wp-admin/includes/ - [F,L]
  RewriteRule !^wp-includes/ - [S=3]
  # If you run multisite, comment the next line out (see note above)
  RewriteRule ^wp-includes/[^/]+\.php$ - [F,L]
  RewriteRule ^wp-includes/js/tinymce/langs/.+\.php - [F,L]
  RewriteRule ^wp-includes/theme-compat/ - [F,L]
</IfModule>

# Set some security related headers
# See: http://de.slideshare.net/walterebert/die-htaccessrichtignutzenwchh2014 (GERMAN)
<IfModule mod_headers.c>
  Header set X-Content-Type-Options nosniff 
  Header set X-XSS-Protection "1; mode=block" 
  # The line below is an advanced method for a more secure configuration, please see documentation before usage!
  # Introduction: https://scotthelme.co.uk/content-security-policy-an-introduction/
  # http://www.heise.de/security/artikel/XSS-Bremse-Content-Security-Policy-1888522.html (German)
  # Documentation: https://content-security-policy.com/
  # Analysis: https://securityheaders.io/
  # Header set Content-Security-Policy "default-src 'self'; img-src 'self' http: https: *.gravatar.com;"
</IfModule>

# Allow WordPress Embed
# https://gist.github.com/sergejmueller/3c4351ec29576fb441fe
<IfModule mod_setenvif.c>
    SetEnvIf Request_URI "/embed/$" IS_embed
    <IfModule mod_headers.c>
    	Header set X-Frame-Options SAMEORIGIN env=!REDIRECT_IS_embed
    </IfModule>
</IfModule>

#Force secure cookies (uncomment for HTTPS)
<IfModule mod_headers.c>
  # Header edit is requiring Apache 2.2.4 or above
  # Header always edit Set-Cookie ^(.*)$ $1;HttpOnly;Secure
  # For Apache lower than 2.2.4 you can use this:
  # Header set Set-Cookie HttpOnly;Secure
  # Source: https://geekflare.com/httponly-secure-cookie-apache/
</IfModule>

#Unset headers revealing versions strings
<IfModule mod_headers.c>
  Header unset X-Powered-By
  Header unset X-Pingback
  Header unset SERVER
</IfModule>

# Filter Request Methods
# See: https://perishablepress.com/disable-trace-and-track-for-better-security/
<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{REQUEST_METHOD} ^(TRACE|DELETE|TRACK) [NC]
  RewriteRule ^(.*)$ - [F,L]
</IfModule>

@goonee

Is that an error here?

No. The explanation is in the comment above. "(uncomment for HTTPS)". Because not every website is on https, I commented this out to not break websites after copy & pasting this code. If your website is on https you can (and should) uncomment this.

any idea what might be the problem?

If there are no cookies set then there is no need to send them with secure flag ;)

Thanks for the info! Sorta new to this, so just trying to navigate through it all best I can:)

Hi,

In cpanel server info see Apache Version | 2.4.57. Header always edit Set-Cookie ^(.*)$ $1;HttpOnly;Secure dont work, but work Header set Set-Cookie HttpOnly;Secure. But why and how remove set-cookie | PH_HPXY_CHECK=s1; path=/. When scan website on securityheaders.com or other websites see both line

1. set-cookie | HttpOnly;Secure;SameSite=Strict
2. set-cookie PH_HPXY_CHECK=s1; path=/