Developers guide says:
"Messages created by your new code can be parsed by your old code: old
binaries simply ignore the new field when parsing. However, the unknown
fields are not discarded, and if the message is later serialized, the
unknown fields are serialized along with it – so if the message is passed
on to new code, the new fields are still available."
I'm interested in exactly this scenario - old client gets a message from
the new client, changes something, and sends it back.
I gave it a try, and what I saw is that new proto fields are stored in
unknownFields. But when I do build(), these fields are discarded.
So when the message is serialized, the new fields are gone. Am I doing it
I found that I could simply serialize the message, and then separately
serialize the unknownFieldSet, so they are concatenated to the message.
But this doesn't feel like the right way. Is it ?
I also found this: https://github.com/bivas/protobuf-java-format/pull/26,
but last activity was a year ago.
What's the right way of having the old client serialize a message including
fields it doesn't understand ?
You received this message because you are subscribed to the Google Groups
"Protocol Buffers" group.
To unsubscribe from this group and stop receiving emails from it, send an email
To post to this group, send email to email@example.com.
Visit this group at https://groups.google.com/group/protobuf.
For more options, visit https://groups.google.com/d/optout.