public NegotiationType getNegotiationType() {
        return this.negotiationType == null ? DEFAULT_NEGOTIATION_TYPE : this.negotiationType;
    }
Gets the negotiation type to use on the connection.

@return The negotiation type that the channel will use.

@see #setNegotiationType(NegotiationType)
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/config/GrpcChannelProperties.java