[openstreetmap/openstreetmap-website] Bad Request (400) - Version may not be negative at line 1 (#2240)

[Tobias Zwick]

I'm using `POST changeset/$id/upload` with the body being `osmChange`, that's diff upload right?

Was this changed today or in the last few days, the move to cgimap? That would explain why I get those reports now.

If that is the case, I have a hunch why this worked before at all: Maybe the previous rails implementation returned simply a `409 Conflict` if the version given in the diff is not the same as the current server version? Cause that case is covered within the app - the app handles a conflict exception by re-downloading the newest version from the OSM Api and then trying again to upload the element with the changes applied.

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