Merge pull request #26 from github/served-by-pages-404

Properly detect if domain is served by pages for non-200 response codes

Author: benbalter

lib/github-pages-health-check.rb

@@ -150,7 +150,8 @@ def served_by_pages?
       if response.mock? && response.headers["Location"]
         response = Typhoeus.head(response.headers["Location"], TYPHOEUS_OPTIONS)
       end
-      response.success? && response.headers["Server"] == "GitHub.com"
+      
+      (response.mock? || response.return_code == :ok) && response.headers["Server"] == "GitHub.com"
     end
 
     def to_json