If you're trying to get your Custom Domain setup to work, and are frustrated (as I am) by the fact that you can't get both "www.yourdomain.com" and "yourdomain.com" to forward properly, you may have complained to your DNS provider, suspecting that the problem is one which they must resolve.
And in some cases, your DNS provider may not know how to setup a "CNAME" record. Some providers only use "A" records.
Some DNS providers will convince you to use URL forwarding, where your domain is redirected to the DNS providers servers. They set their servers to simply load any portion of the desired website ("www.yourdomain.com" or "yourdomain.com") from your Blog*Spot website ("yourblog.blogspot.com").
This will indeed load the content, as desired. There are several downsides to this "solution", though.
- Your DNS provider may have to set this up in their servers, it's possibly not a DNS setting that you can make.
- As the reader views your redirected blog, the content of the address bar in the browser will constantly indicate "www.yourdomain.com" or "yourdomain.com", with no detail about the actual URL being viewed.
- We're unsure about how well search engine spiders, and other robotic visitors, will react to URL forwarding.
- URL forwarding bypasses the load balancing provided by "ghs.google.com", and this is bad for everybody.
Blogger has admitted that Custom Domains needs work. Let's wait for them to figure out how it should be setup, at their end. Try and avoid using URL Forwarding, unless you are really desperate.