问题
My website using SSL: https://sharengay.com . I need to add a subdomain like http://hdonline.sharengay.com
I added this code into .htacess file:
RewriteCond %{HTTP_HOST} ^(www\.)?example\.com$ [NC]
RewriteCond %{HTTPS} off
# First rewrite to HTTPS:
# Don't put www. here. If it is already there it will be included, if not
# the subsequent rule will catch it.
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# Now, rewrite any request to the wrong domain to use www.
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
Yes, it works perfectly. URL: http://hdonline.sharengay.com is available. Have two the problem when adding this code.
The first problem:
When any user visit URL: http://hdonline.sharengay.com . Google Analytics can't detect from the domain (https://sharengay) or subdomain(http://hdonline.sharengay.com). It found it like one URL: \ - like domain.
Here is image easy to know:
At I mark in the picture, I tried to visit http://hdonline.sharengay.com but Google Analytics detect is /.
The second problem: - I think the problem is not related with code added on .htaccess
Normally, each user visits my site range 2 - 3 minutes. From add this code to .htaccess, time visit about 40 seconds. I don't know to add this code to .htaccess is affect to time view on my website.
I think: "it's not". But the result is opposite. The subdomain is got video from a service in my country, I think the user can stay here for more than 2 minutes. Instead of only 40s - 1m40s.
来源：https://stackoverflow.com/questions/50803894/google-analytics-dont-detect-subdomain-after-redirect-all-subdomain-to-http