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I know nothing about what has been implemented by Google/Fastly. All I can point you to is the details of Cloudflare's implementation and RFCs (which we co-authored): https://datatracker.ietf.org/doc/draft-ietf-ohai-ohttp/

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I can confirm that this is also the spec that we implemented at Fastly for this OHTTP relay service.

We followed the same spec on the Google side (obviously). Our implementation of the request encapsulation/decapsulation for OHTTP is open sourced in Google Quiche. https://github.com/google/quiche/tree/main/quiche/oblivious_...

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