IAM in Service Catalog
For example, u:spud_123 is a UWNetID, wheres whereas g:spud_123 is a group name.
If-None-Match header matches group's ETag
Group not found
The response will be 404 only if the group is not found. If one or more members are not found, or if they are not in the dependency group, the response will be 200 and a class="notfoundmembers"element will be included, containing one "notfoundmember" element for each bogus member.
<span class="notfoundmembers"> <span class="notfoundmember">member_id</span> ... </span>