I expect all sorts of intermediaries may drop the body, since having a body is forbidden by the standard.
replyWhen it's your client talking to your server you can obviously do whatever you want - it doesn't cause problems until you want to involve third-party code, such as a reverse proxy (such as nginx) or a CDN. This includes proxies your customers may be using.
Where is it forbidden by the standard? I don't see anything in the GET definition in RFC 9110 [1] forbidding that. My understanding was that this is just undefined behavior. And not recommended due to your point about some third-party CDNs and RPs handling that UB in different ways.
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