Here are some options:
External assets
DirList.aspx
DirListSingle.aspx
DirListSingleRecurse.aspx
External_assets.aspx?dirId=%id% id 2 gives different content
SearchAssets.aspx?searchString=%search%
External snippets
ExternalSnippetsDirectories.xml
SomeQa4Snippets.aspx?dirId=%id%
ExternalSnippetSearch.aspx?searchString=%search%
CORS / credentials test
LoginScreen.aspx
Serve_cookieTest.aspx
HttpContext.Current.Request.Url:
Url.AbsoluteUri: https://externalassets.qa.chili-publish.com/index.aspx
Url.Scheme: https
Url.Segments: {/ , index.aspx}
Url.Host: externalassets.qa.chili-publish.com