redirecting urls to add www to the host if it does not exists

The only reason I didn't just redirect all requests to the actual domain was a case where a developer had typed in the IP address and was trying to test it directly so that it would preserve the IP when it redirected.

 

 

TLS SNI looks very interesting, but I think i will just deal with the occurrence of someone typeing in https and leaving off the www

 

 

 

Is there any way to use the GTM that is responding to the DNS to redirect any simple.com to www.simple.com? Right now I plan to just cname it , but that leaves me with an HTTPS VS that will get a cert error if it reaches there without the www.

 

 

 

I know google does this somehow if you go to https//:google.com it redirects to https://www.google.com, however I noticed amazon does not do that.

 

 

 

 

Thank you very much for your reply.