This page has a link to a manifest06.appcache file which has a NETWORK: section listing two URLs:
CACHE MANIFEST # 0.0.1v jquery.js NETWORK: http://codebits.glennjones.net/appcache/network/test01.json http://codebits.glennjones.net/appcache/network/test02.json
This test is to see if there is in difference in the function of the
NETWORK: section if the URLs are relative to the site and manifest file. The XHR calls pull two local JSON files.