为什么我会进入无休止的重定向周期?

I installed basic Yii2 application and want to force all connections to use HTTPS instead of HTTP. Here my .htaccess:

RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,NE,R=301]

RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]
RewriteRule (.+)/$ /$1 [L,R=301]
RewriteCond %{THE_REQUEST} ^.*/index\.php
RewriteRule ^(.*)index.php$ /$1 [R=301,L]
RewriteCond %{THE_REQUEST} ^.*/index\.html
RewriteRule ^(.*)index.html /$1 [R=301,L]
RewriteCond %{THE_REQUEST} ^.*/main\.html
RewriteRule ^(.*)main.html /$1 [R=301,L]

# If a directory or a file exists, use the request directly
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# Otherwise forward the request to index.php
RewriteRule . index.php

And in web/index.php I'm adding

$_SERVER['HTTPS']='on';

When I open site I see an error "too many redirects". I check chrome network inspector and I see that from https://example.org I'm redirecting to https://example.org and so get into the cycle

I used following code to redirect http to https in .htaccess file

RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
RewriteCond %{SERVER_PORT} 80
RewriteRule ^(.*)$ https://example/$1 [R=301,L]

It redirects all request on port 80 to https.