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PUT is idempotent, and also used to create new resources. I would use that rather than POST. [1][2]

[1] http://stackoverflow.com/a/630475/443363

[2] http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html

I'm curious how idempotence figures into something like this. If you make the same request twice, the horn should honk twice.

> If you make the same request twice, the horn should honk twice.

Exactly. That means this request is not idempotent, so PUT shouldn't be used. Of GET, PUT, POST and DELETE, only POST is not supposed to be idempotent, so it would be the preferred method to use for this request.

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