Amazon uses CBOR extensively. Most AWS services by now should support being called using CBOR. The protocol they're using is publicly documented at: https://smi

Amazon uses CBOR extensively. Most AWS services by now should support being called using CBOR. The protocol they're using is publicly documented at: https://smithy.io/2.0/additional-specs/protocols/smithy-rpc-v2.html https://smithy.io/2.0/additional-specs/protocols/smithy-rpc-... The services serve both CBOR and other protocols simultaneously.