CodeIgniter htaccess modification for semi https and without www version - php

Question

Rather than in core PHP, htaccess modification is different.
So, after some searching I have reached to the following code.
before that,
my requirements are standard in my project.
www is strictly not allowed in whole site. i.e. redirect directly to non-www version.
HTTPS is for some pages. (checkout, login page) . Strictly HTTP for other pages.
removing CodeIgniter's default index.php
Here is my code.
RewriteEngine on
#################################
# force HTTPS
RewriteCond %{HTTPS} =off
RewriteCond %{REQUEST_URI} (checkout|login)
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# force HTTP
RewriteCond %{HTTPS} =on
#RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteCond %{REQUEST_URI} !(checkout|login|css|img|js)
RewriteRule .* http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# Strict to non-www version >>> Not Working
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^(.*)$ http://%1%{REQUEST_URI}/$1 [R=301,NE,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [L]
Issue: Not able to reach to result of non-www version of site
update(17 Oct)
# Strict to non-www version.
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteCond %{REQUEST_URI} (login|account_detail|alternate_address|update_password)
RewriteRule ^ https://%1%{REQUEST_URI} [R=301,L,QSA]
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteCond %{REQUEST_URI} !(login|account_detail|alternate_address|update_password|https|css|img|js|resources|images)
RewriteRule ^ http://%1%{REQUEST_URI} [R=301,L,QSA]
# force HTTPS
RewriteCond %{HTTPS} =off
RewriteCond %{REQUEST_URI} (login|account_detail|alternate_address|update_password)
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# force HTTP
RewriteCond %{HTTPS} =on
RewriteCond %{REQUEST_URI} !(login|account_detail|alternate_address|update_password|https|css|img|js|resources|images)
RewriteRule .* http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [L]
On this new updated code, htaccess tester site displaying everything perfectly.
But, after updating to site there are many issues.
When I open this link
https://example.com/login
It keeps looping, not stopping.
And on this link
http://www.example.com/login
it redirects to
https://login/login

Answer 1

It is easier to handle the no-www and toggle-protocol redirects separately. In the following example:
The www requests are redirected to no-www as-is (handle toggle-protocol redirect on next request)
The http requests for selected pages are redirected to https version
The https requests for other pages are redirected to http version
Note the leading /...(/|$) in the following examples. They ensure that complete path fragments are matched (e.g. in the third set of rules /js/main.js matches but /jsmith/profile does not).
RewriteEngine On
# Force NOWWW
RewriteCond %{HTTP_HOST} ^www\.(.+) [NC]
RewriteRule ^ http://%1%{REQUEST_URI} [R=302,L]
# Force HTTPS
RewriteCond %{HTTPS} =off
RewriteCond %{REQUEST_URI} /(login|account_detail|alternate_address|update_password)(/|$)
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=302,L]
# Force HTTP
RewriteCond %{HTTPS} =on
RewriteCond %{REQUEST_URI} !/(login|account_detail|alternate_address|update_password|css|img|js)(/|$)
RewriteRule ^ http://%{HTTP_HOST}%{REQUEST_URI} [R=302,L]
# Hijack all requests
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.php/$0 [L]
The following tests passed:
http://www.example.com/
http://example.com/
http://www.example.com/a/b?c=3&d=4
http://example.com/a/b?c=3&d=4
http://www.example.com/login
http://example.com/login
https://example.com/login
https://www.example.com/js/javascript.js
https://example.com/js/javascript.js
http://example.com/js/javascript.js
Note: Remember to replace 302 with 301 after testing.