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From intermediate (MITM) caches, yes. But end-clients can still cache it though.

Our market is more backend API traffic so doesn't impact as much.

Since it's becoming harder and harder to implement transparent proxies and caches, someone should define a local cache protocol so that network administrators can configure explicit shared caches for the devices on their networks.

> someone should define a local cache protocol

Someone did, almost two and a half decades ago. It's called the Internet Cache Protocol.

- Internet Cache Protocol (ICP), version 2 [0]

- Application of Internet Cache Protocol (ICP), version 2 [1]

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[0]: https://tools.ietf.org/html/rfc2186

[1]: https://tools.ietf.org/html/rfc2187

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