gRPC

• use of HTTP/2 trailers to convey request status.
• The gRPC runtime for some languages is relatively immature.
• gRPC-Web is supported by a filter that allows a gRPC-Web client to send requests to Envoy over HTTP/1.1 and get proxied to a gRPC server.
• gRPC-JSON transcoder is supported by a filter that allows a RESTful JSON API client to send requests to Envoy over HTTP and get proxied to a gRPC service.

gRPC bridging(will be replaced by gRPC-web)

gRPC services

Envoy makes use of gRPC for its control plane

MongoDB

DynamoDB

Redis

Postgres