Apache VirtualHost: strip www. and force https - apache

Question

I am working on a site that only owns an SSL cert for monsite.fr. I am trying to remove the www. and redirect to https://monsite.fr.
the redirection doesn't work if the user type www.monsite.fr, he WILL NOT be redirected to https://monsite.fr but to https://www.monsite.fr and get certification error NET::ERR_CERT_COMMON_NAME_INVALID.
This is the content of mysite.conf file:
<IfVersion < 2.3 >
NameVirtualHost *:80
NameVirtualHost *:443
</IfVersion>
<VirtualHost *:80>
ServerName monsite.fr
Redirect / https://monsite.fr/
#RewriteEngine On
#RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
#RewriteRule ^(.*)$ https://%1$1 [R=permanent,L]
</VirtualHost>
<VirtualHost *:80>
ServerName www.monsite.fr
Redirect / https://monsite.fr/
</VirtualHost>
<VirtualHost *:443>
ServerName monsite.fr
ServerAlias www.monsite.fr
#RewriteEngine On
#RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
#RewriteRule ^(.*)$ https://%1$1 [R=permanent,L]
RewriteEngine On
RewriteCond %{HTTPS} =on
RewriteCond %{HTTP_HOST} ^www\.
RewriteRule ^(.*)$ https://monsite.fr/$1 [R,QSA,L]
DocumentRoot "/opt/monsite.fr/htdocs"
</VirtualHost>
Is there a solution to redirect www.monsite.fr to https://monsite.fr ?

Answer 1

Modify your vhost configuration as follows:
<VirtualHost *:80>
ServerName www.monsite.fr
ServerAlias monsite.fr
RedirectMatch ^/(.*)$ https://monsite.fr/$1
</VirtualHost>
<VirtualHost *:443>
ServerName www.monsite.fr
RedirectMatch ^/(.*)$ https://monsite.fr/$1
</VirtualHost>
<VirtualHost *:443>
ServerName monsite.fr
SSLEngine On
SSLCertificateFile /path_to_cert/server.crt
SSLCertificateKeyFile /path_to_key/server.key
DocumentRoot "/opt/monsite.fr/htdocs"
</VirtualHost>
The first virtual host block will redirect all requests from http://www.monsite.fr to https://monsite.fr. It will also redirect all requests from http://monsite.fr to https://monsite.fr
The second virtual host block will redirect all requests from https://www.monsite.fr to https://monsite.fr.
The third virtual host block will serve the content for https://monsite.fr. Make sure to edit the above mentioned configuration and add the correct path /path_to_cert/server.crt for the SSL certificate and /path_to_key/server.key for the private key.