gRPC channels are an abstraction of a connection to an endpoint, used for sending and receiving messages. They’re created with the target’s address and port, and optional parameters like credentials. Channels manage connections, reconnections, and load balancing.
In communication, gRPC uses HTTP/2 as its transport protocol, allowing multiple concurrent calls over one TCP/IP connection, improving performance. The client sends requests via the channel, which delivers them to the server. The server processes the request and returns a response through the same channel.
Channels can be stateful: Idle when no RPCs, Connecting during transitions, Ready when it can handle RPCs, and TransientFailure if interrupted. This helps in managing network issues efficiently.
