To www or not www

Domain names historically have been www.example.com , written also with the protocol prefix http://www.example.com , but in reality www. is optional, only example.com is actually needed.

www. is technically a sub-domain and sub-domains incur a small penalty in search engine optimization.

There is no right or wrong. What is important is that you choose one, and the other needs to be a 301 Permanent Redirect to the one you have chosen.

You also need to know that creating a server alias in your web server configuration, for example Apache or Tomcat is not a permanent redirect, in-fact it is technically duplicate content, with two web sites the same also incurring a penalty for search engine rating.

So what do the big players do. Here are a few.

Use www

Do not use www

  • digg.com
  • wordpress.com
  • identi.ca

Show duplicate content

  • flickr.com
  • chi.mp
  • corkd.com
  • vimeo.com
  • garysguide.org
  • engineyard.com

Curiously youtube.com uses a 303 redirect, microsoft.com, stumbleupon.com and craigslist.org a 302 redirect.

How do you check? Use a CLI tool such as wget.

$ wget www.google.com
--2008-09-22 19:56:48--  http://www.google.com/
Resolving www.google.com... 72.14.205.99, 72.14.205.103, 72.14.205.104, ...
Connecting to www.google.com|72.14.205.99|:80... connected.
HTTP request sent, awaiting response... 200 OK

$ wget google.com
--2008-09-22 19:57:56--  http://google.com/
Resolving google.com... 64.233.167.99, 64.233.187.99, 72.14.207.99
Connecting to google.com|64.233.167.99|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://www.google.com/ [following]

$ wget www.facebook.com
--2008-09-22 20:07:59--  http://www.facebook.com/
Resolving www.facebook.com... 69.63.178.12
Connecting to www.facebook.com|69.63.178.12|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]

$ wget facebook.com
--2008-09-22 19:59:43--  http://facebook.com/
Resolving facebook.com... 69.63.176.140, 69.63.178.11
Connecting to facebook.com|69.63.176.140|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://www.facebook.com/ [following]


$ wget digg.com
--2008-09-22 20:10:47--  http://digg.com/
Resolving digg.com... 64.191.203.30
Connecting to digg.com|64.191.203.30|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 15322 (15K) [text/html]


$ wget www.digg.com
--2008-09-22 20:14:06--  http://www.digg.com/
Resolving www.digg.com... 64.191.203.30
Connecting to www.digg.com|64.191.203.30|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://digg.com/ [following]


$ wget twitter.com
--2008-09-22 20:26:18--  http://twitter.com/
Resolving twitter.com... 128.121.146.100
Connecting to twitter.com|128.121.146.100|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2655 (2.6K) [text/html]

$ wget www.twitter.com
--2008-09-22 20:26:41--  http://www.twitter.com/
Resolving www.twitter.com... 128.121.146.100
Connecting to www.twitter.com|128.121.146.100|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: http://twitter.com/ [following]

Professionally, I prefer shorter and simpler without www.

References:

Tagged with: SEO Web Web Development Web Sites

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