We need the option that the compressed HTTP payload would be passed through without decompressing and recompressing

The following three points are what we need.
1)When the payload sent from the client is compressed and the compression setting of invoke / proxy of the API definition is TRUE, the request body is passed through to the back end as it is.Check size upper limit by size of compressed data.
2)When the received payload is compressed and Accept-Encoding: gzip exists in the request header of the client, the response body is passed through to the client as it is. and check size upper limit by size of compressed data
3)The policy which does not handle the request and response body also should be effective in case of compressed data.

In order to reduce http overhead, large payloadare compressed from json to gzip, and we want to send and receive payloadbetween client and DataPower Gateway, because our payloadsize tends to increase up to the characteristics of business when using APIConnect and exposing the payloadof our core system as a Web API.
However, when payload is compressed in HTTP, the payloadis decompressed and recompressed in all communications in Datapower, and the performance of the gateway gets worse.
If Client gives Accept-Encoding: gzip and the backend also returns compressed data, the DataPower Gateway should be able to passes through the received payload without decompressing and recompressing it to the client We want to have an option to make it work like this.