public static ClientBuilder builder(SessionProtocol protocol, EndpointGroup endpointGroup) {
        return builder(Scheme.of(SerializationFormat.NONE, requireNonNull(protocol, "protocol")),
                       endpointGroup);
    }
Returns a new {@link ClientBuilder} that builds the client that connects to the specified
{@link EndpointGroup} with the specified {@link SessionProtocol}.
core/src/main/java/com/linecorp/armeria/client/Clients.java