yes and no. You need a controller that returns tha page and then you need 
to request the data via ajax or via a LOAD(... ajax=True) helper.

On Thursday, 3 December 2015 15:33:04 UTC-6, Brian Craft wrote:
>
> A large query is causing the client (browser) to become unresponsive, 
> because web2py doesn't return anything to the client until the controller 
> function has completed.
>
> It needs, instead, to return a chunked response header immediately, with 
> the data to follow. From the controller I can return an iterator, which 
> will send a chunked response, but doesn't help because the query still runs 
> in the context of the controller function, before web2py can return 
> anything.
>
> If I defer the query (return an iterator that lazily runs the query), the 
> query fails because the database connection is closed after the controller 
> returns.
>
> Is there any way to get web2py to return a header to the client before the 
> db query is run?
>

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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