@UnstableApi
    public static <T> T newClient(HttpPreprocessor httpPreprocessor, Class<T> clientType) {
        return newClient(SerializationFormat.NONE, httpPreprocessor, clientType);
    }
/**
Creates a new gRPC client that is configured with the specified {@link HttpPreprocessor} using
{@link GrpcSerializationFormats#PROTO} and the default {@link ClientFactory}.

@param httpPreprocessor the {@link HttpPreprocessor}
@param clientType the type of the new gRPC client

@throws IllegalArgumentException if the {@code clientType} is an unsupported gRPC client stub.
grpc/src/main/java/com/linecorp/armeria/client/grpc/GrpcClients.java