For a generic proxy solution for HTTP outcalls to support both IPv6 and idempotent answers, there are a couple of other references:
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Recently, @zensh shared a solution on this topic: Idempotent Proxy Show: proxy HTTPS Outcalls to any Web2 service
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Additionally, @massimoalbarello and @ilbert have proposed another solution parts of their IC Side Services activities: Non replicated HTTPS outcalls
PS: If not the case, it would be worth it if the foundation documented these solutions somewhere. It feels like I keep copying and pasting the same links in multiple threads.