But, the problem is: if I edit the web item with non-Admin user account (of course I can NOT see the "proxy support" option there), then, after Save, I saw on the Web list, there shows:
Proxy Support : No
Which I remeber was "Yes" on the list page BEFORE I edit it.
So, the key of my question is: Why the "proxy support" was disabled
after save while I NEVER have a chance to disable it on the editing page?