passing in external website URL for Aras item startpage


Following along with the first section of this out-of-date blog post: Displaying HTML in Aras Innovator - English Blog - Aras Community - Aras Community

In Release 28 (but probably true of every release since the TOC administration changes, I’d guess) I was able to get a sample html page stored in the codetree working, after realizing I needed to change the Additional Data under the Client Style CommandBarItem to include the startPage value instead of using the TOC View relationship mentioned in the blog post.

But what I’d like to be able to do is try out what the blog post mentions about passing in an external page (such as aras.com, or our company's website), but that doesn’t seem to work. If I use the url as-is like that for the startPage, I get the following error:

The webpage at localhost/.../ might be temporarily down or it may have moved permanently to a new web address.