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OK, I think that gets to the heart of the question. I've expanded on it a little to cover a wider range of invalid operations - presumably for these 400 is the correct response?

FinnNk
– FinnNk

2012-03-29 14:16:14 +00:00
Commented Mar 29, 2012 at 14:16
@FinnNk No, 400 Bad Request is only when the server can't understand what the client was trying to do at all. If it understood the request but the content of the request is invalid, you want to respond with 409 Conflict.

user8
– user8

2012-03-30 02:17:47 +00:00
Commented Mar 30, 2012 at 2:17

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