Solved
allowProxy Clientlibs
How does by adding allow proxy for clientlibs, css, js will be loaded on dispatcher or publisher?
Searched for the internal working of that but didn't found any source.
Allowing proxies for ClientLibs means configuring AEM to serve these resources through a proxy URL pattern. This is typically done to namespace and manage access to these resources efficiently. For example, you might serve all client-side resources under a path like /etc.clientlibs/ which is proxied to a more accessible path like /libs/.
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