From the [page I linked before](http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.2.3): "The entity returned with this response SHOULD include an indication of the request's current status and either a pointer to a status monitor or some estimate of when the user can expect the request to be fulfilled."  I don't think that would make sense here, which suggests to me that it's not the ideal response.

I think a 200 would be appropriate here (or a 204, if we didn't need a response entity).