At work, we're trying to determine the effectiveness of domain collapsing for SEO purposes. Our current structure is to have multiple web apps served from different servers, such as
PUBLIC URLS - directly accessed by users
www1.somecompany.com/webapp1
www2.somecompany.com/webapp2
www3.somecompany.com/webapp3
I'm proposing to put an Apache proxy in front of these applications that will mask the different domains and route the requests to proper server
PUBLIC URL--------routed/forwarded to-----PRIVATE URL
www.somecompany.com/webapp1 <-----> www1.somecompany.com/webapp1
www.somecompany.com/webapp2 <-----> www2.somecompany.com/webapp2
www.somecompany.com/webapp3 <-----> www3.somecompany.com/webapp3
In terms of SEO/page rank value, does this help?
The page rank value of each
/webappN
can be different, so you could just as well use subdomains and properly route each app to its own server via A records, without the need for proxying.