addressable has a helper method for this

app/helpers/posts_helper.rb

@@ -20,7 +20,7 @@ module PostsHelper
   def post_iframe_url(post_id, opts={})
     opts[:width] ||= 516
     opts[:height] ||= 315 
-    host = AppConfig[:pod_uri].port ==80 ? AppConfig[:pod_uri].host : "#{AppConfig[:pod_uri].host}:#{AppConfig[:pod_uri].port}"
+    host = AppConfig[:pod_uri].site
    "<iframe src='#{Rails.application.routes.url_helpers.post_url(post_id, :host => host)}' width='#{opts[:width]}px' height='#{opts[:height]}px' frameBorder='0'></iframe>".html_safe
   end
 end