correction to htaccess

<IfModule mod_headers.c>
   Header set Connection keep-alive
</IfModule>

<IfModule mod_expires.c>
ExpiresActive On
AddType application/vnd.ms-fontobject .eot
AddType application/x-font-ttf .ttf
AddType application/x-font-opentype .otf
AddType application/x-font-woff .woff
AddType image/svg+xml .svg
ExpiresByType application/vnd.ms-fontobject "access 1 year"
ExpiresByType application/x-font-ttf "access 1 year"
ExpiresByType application/x-font-opentype "access 1 year"
ExpiresByType application/x-font-woff "access 1 year"
ExpiresByType image/svg+xml "access 1 years"
ExpiresByType text/html "access 1 months"
ExpiresByType text/css "access 1 months"
ExpiresByType text/x-javascript "access 1 year"
ExpiresByType application/javascript "access 1 year"
ExpiresByType application/x-javascript "access 1 year"
ExpiresByType image/gif "access 1 year"

ExpiresByType image/png "access 1 year"
ExpiresByType image/jpg "access 1 years"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 years"
ExpiresByType application/pdf "access 8 months"
ExpiresByType application/x-shockwave-flash "access 8 months"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 2 months"
</IfModule>


Options +FollowSymlinks -MultiViews
RewriteEngine On

RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [L,NE,R=301]


RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]

RewriteCond %{THE_REQUEST} ^.*/index.php
RewriteRule ^(.*)index.php$ https://drevelina.co.il/$1 [R=301,L]

RewriteCond %{THE_REQUEST} ^.*/index.html
RewriteRule ^(.*)index.html$ https://drevelina.co.il/$1 [R=301,L]

#RewriteCond %{THE_REQUEST} \s/+index/(\S+) [NC]
#RewriteRule ^ %1 [R=301,L]


#remove php ext
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)\.php [NC]
RewriteRule ^ %1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*?)/?$ $1.php [NC,L]

ErrorDocument 404 /404.shtml
ErrorDocument 500 /500.shtml


# Extra Security Headers
<IfModule mod_headers.c>
    ServerSignature Off
    Header set X-XSS-Protection "1; mode=block"
    Header always append X-Frame-Options SAMEORIGIN
    Header set X-Content-Type-Options nosniff
</IfModule>