CodeIgniter htaccess www to non www and http to https - .htaccess

Question

I have tried many things but failed. Something work for http to https and some for www to non www. But when I try modification for both http to https along with www to non www it broke my website.
Please help me in .htaccess modification for both rules
This the full of default .htaccess file
It successfully redirects http to https and www to non-www. but when I type http://www.xzy.com page show blank
# Case 1
# -------------------------------------------------------#
# RewriteEngine On
# DirectoryIndex index.html index.php
# RewriteCond %{HTTPS} !=on
# RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteCond %{REQUEST_FILENAME} !-d
# RewriteRule ^(.*)$ index.php/$1 [L]
# -------------------------------------------------------#
# Case 2
# -------------------------------------------------------#
# RewriteEngine on
# ExpiresActive On
# ExpiresDefault A2592000
# RewriteCond %{SERVER_PORT} 80
# RewriteRule ^.*$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# RewriteCond $1 !^(index\.php|images|public|assets|uploads|themes|install|backups|updates|asset|mob|robots\.txt|curl.php)
# RewriteRule ^(.*)$ index.php?/$1 [QSA,L]
# -------------------------------------------------------#
# Case 3
# -------------------------------------------------------#
# <IfModule mod_rewrite.c>
# RewriteEngine On
# RewriteCond %{REQUEST_URI} ^system.*
# RewriteRule ^(.*)$ index.php?/$1 [L]
# RewriteCond %{REQUEST_URI} ^application.*
# RewriteRule ^(.*)$ index.php?/$1 [L]
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteCond %{REQUEST_FILENAME} !-d
# RewriteRule ^(.*)$ index.php?/$1 [L]
# </IfModule>
# -------------------------------------------------------#
# Case 4
# -------------------------------------------------------#
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]
# -------------------------------------------------------#
# Case 6 for SSL Hosting
# -------------------------------------------------------#
# RewriteEngine on
# ExpiresActive On
# ExpiresDefault A2592000
# RewriteCond %{SERVER_PORT} 80
# RewriteRule ^.*$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# RewriteCond $1 !^(index\.php|images|public|assets|uploads|themes|install|updates|asset|mob|robots\.txt)
# RewriteRule ^(.*)$ index.php?/$1 [QSA,L]
# -------------------------------------------------------#
# case 5
# -------------------------------------------------------#
#RewriteEngine On
#DirectoryIndex index.html index.php
#RewriteCond %{REQUEST_FILENAME} !-f
#RewriteCond %{REQUEST_FILENAME} !-d
#RewriteRule (.*) index.php/$1
# -------------------------------------------------------#
# secure GIT files
RedirectMatch 404 /\.git
<FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=604800, public"
</FilesMatch>
## EXPIRES CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 2 days"
</IfModule>
## EXPIRES CACHING ##
<ifModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_item_include file .(html?|txt|css|js|php|pl)$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^application/x-javascript.*
mod_gzip_item_exclude mime ^image/.*
mod_gzip_item_exclude rspheader ^Content-Encoding:.*gzip.*
</ifModule>
It successfully redirects http to https and www to non-www. but when I type http://www.xzy.com page show blank

Answer 1

Try this code to solve your issue
RewriteEngine on
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

Answer 2

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/system.*
RewriteRule ^(.*)$ index.php/?$1 [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteBase /
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
</IfModule>