RJ's Offline Server Skins
Make offline servers assign player skins from custom URLs each relog, and let clients load unauthenticated skins.
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RJ's Offline Server Skins
This server+clientside mod exists so I can allow players at an after-school club to pick a skin, and make it work with a server in offline mode and no internet access on either the server or clients.
You need a webserver (on the LAN) which serves up skins at a custom URL, configured in this config file which the server relies on: