delete cache after an error with auth endpoint

This solves #146 where you would get an error message after changing the authorization endpoint if the site had already cached your endpoint. Now it will delete the cache if it encounters that error, so starting over will find the new endpoint.

controllers/auth-web.rb

@@ -287,7 +287,7 @@ def save_response_type
         }
       end
     end
-
+    
     # If only one profile is set, and it's an indieauth authorization endpoint, then skip directly to it
     if @profiles.length == 1 && @profiles[0]['provider'] == 'indieauth'
       profile = @profiles[0]
@@ -466,10 +466,11 @@ def save_response_type
       return erb :error
     end
 
-    # TODO: if the user had only one auth endpoint and they were redirected here skipping the prompt,
-    # then we need to clear the cache and re-check for an endpoint for them.
+    # if the user had only one auth endpoint and they were redirected here skipping the prompt,
+    # then we need to clear the cache tell them to try again
     if !links.include?(profile) and !auth_endpoints.include?(profile) and !gpg_keys.map{|a| a[:href]}.include?(profile)
-      @message = "\"#{params[:profile]}\" was not found on the site \"#{params[:me]}\". Try re-scanning after checking your rel=me links on your site."
+      Profile.delete_profile me
+      @message = "\"#{params[:profile]}\" was not found on the site \"#{params[:me]}\". The cache has been cleared, please go back and try again."
       title "Error"
       return erb :error
     end