I’ve been doing some experiments with HTTP textures, and yes, you can proxy/cache them external to your machine even though the viewer doesn’t support it.

There are benefits to this and some downsides. It’s particularly handy if you’re behind a corporate or educational firewall and your network admin would prefer to proxy rather than open up a new port. Caching improvements, alas, are fairly dubious.

Proxying Second Life HTTP-textures with Squid

This is moderately advanced material.

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