How should I use Celery when task results are large?

What's the best way to handle tasks executed in Celery where the result is large? I'm thinking of things like table dumps and the like, where I might be returning data in the hundreds of megabytes.

I'm thinking that the naive approach of cramming the message into the result database is not going to serve me here, much less if I use AMQP for my result backend. However, I have some of these where latency is an issue; depending on the particular instance of the export, sometimes I have to block until it returns and directly emit the export data from the task client (an HTTP request came in for the export content, it doesn't exist, but must be provided in the response to that request ... no matter how long that takes)

So, what's the best way to write tasks for this?