can Azure APIM support gRPC protobuf API over http

@BCTAZURE Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.

Based on the above shared information, We have understood that you are looking for information about whether gRPC is supported in Azure APIM. Correct me if my understanding is incorrect.

I have checked with APIM engineering team and sharing the below.

gRPC is not supported on the Azure APIM at the moment and this feature is currently in our product roadmap and we don’t have any exact ETA that can be shareable.

I would suggest you follow this Azure APIM Updates here for more information and updates on Azure API Management.

Feel free to reach back to me if you have any further questions on this.