Method: ActionDispatch::Http::URL.extract_subdomain

Defined in:

actionpack/lib/action_dispatch/http/url.rb

.extract_subdomain(host, tld_length) ⇒ Object

Returns the subdomains of a host as a String given the domain level.

# Top-level domain example
extract_subdomain('www.example.com', 1) # => "www"
# Second-level domain example
extract_subdomain('dev.www.example.co.uk', 2) # => "dev.www"

# File 'actionpack/lib/action_dispatch/http/url.rb', line 48

def extract_subdomain(host, tld_length)
  extract_subdomains(host, tld_length).join(".")
end