docs: protected static io.grpc.netty.shaded.io.netty.handler.ssl.ClientAuth of(final ClientAuth clientAuth) {
          switch (clientAuth) {
              case NONE:
                  return io.grpc.netty.shaded.io.netty.handler.ssl.ClientAuth.NONE;
              case OPTIONAL:
                  return io.grpc.netty.shaded.io.netty.handler.ssl.ClientAuth.OPTIONAL;
              case REQUIRE:
                  return io.grpc.netty.shaded.io.netty.handler.ssl.ClientAuth.REQUIRE;
              default:
                  throw new IllegalArgumentException("Unsupported ClientAuth: " + clientAuth);
          }
      }