public static boolean isGrpcWebText(SerializationFormat format) {
        requireNonNull(format, "format");
        return format == PROTO_WEB_TEXT;
    }
Returns whether the specified {@link SerializationFormat} is gRPC-web-text which encodes messages
using base64.
grpc/src/main/java/com/linecorp/armeria/common/grpc/GrpcSerializationFormats.java