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OP_SERVICE_GET_TOPOLOGY message format

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 - Some delay of the topology obtaining. The invocation redirects are still possible when service migrates.
 - No sign of service cancel/deploy on the client side. We have to update by a timeout too.
 - The topology is probably kept by client while it exists even if the service proxy is not in use any more or if service was canceled.

Discussion Links

https://lists.apache.org/thread/vd0wnwxrg89245kv1nzolfb82j1l7z0t

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