Return values of request.subdomain

rails-3-subdomains.md

Return Values of request.subdomain

Cases

• If request.url is 'http://d.a.b.c', request.subdomain returns 'd.a'
• If request.url is 'http://a.b.c', request.subdomain returns 'a'
• If request.url is 'http://b.c', request.subdomain returns empty string.
• If request.url is 'http://c', request.subdomain returns empty string.

Whether port number is used does not affect return values.. of course.

Examples

request.subdomain returns empty string ('').

• http://localhost:3000
• http://blog.localhost:3008
• http://example.org

request.subdomain returns 'www'

• http://www.example.org
• http://www.example.org:9999

request.subdomain returns 'blog'

• http://blog.localhost.org:3000

request.subdomain returns 'blog.my'

• http://blog.my.co.net

References

• Issue with localhost Subdomains
• Custom Domains in Rails 3