I was reading something about REST and it suggested returning a 202 status
code for async operations.  Should render_then_call have an options
hash for status codes and default to 202?

10.2.3 202 Accepted

The request has been accepted for processing, but the processing has not
been completed. The request might or might not eventually be acted upon, as
it might be disallowed when processing actually takes place. There is no
facility for re-sending a status code from an asynchronous operation such as
this.

The 202 response is intentionally non-committal. Its purpose is to allow a
server to accept a request for some other process (perhaps a batch-oriented
process that is only run once per day) without requiring that the user
agent's connection to the server persist until the process is completed. 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.

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