i think i've seen examples of this, but can't recall where, and could
use some guidance.

Obviously it's easy to handle a 1:1 Request/Response

How can i do a true 1:many process? For instance:
Client takes a single action which requires the server to perform 3
tasks:
* Query database
* Generate PDF
* Generate email, attach PDF, and send

How can i respond to the client as EACH task is accomplished without
ending the request chain?
"Looking up your data . . ." (time-based dots as delay indicator)
"Creating PDF . . ."
"Email sent" (or failed, as the case may be)

Is this done with HTTP 2xx headers? Recursive callbacks? If anyone can
point me in the right direction (which include samples), i'd be
grateful.

Thanks.
-joe t.

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