[openstreetmap/openstreetmap-website] Idempotency for API 0.6 (#2201)

mmd notifications at github.com
Sat Apr 6 10:27:45 UTC 2019

> Why would they get created more than once?

Typical message would, say create 10 new nodes. All of them have negative ids. Sending that message again because of some network failure will create another 10 nodes with different node ids.

This behavior is pretty common across clients these days. If there's some network issue, they let the user retry (or do the retry on their own).

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