Document() function: GET vs. POST

The Document() function can do an HTTP GET. Could it
do an HTTP POST? I can use a stylesheet to query
web services which provide a simple GET interface, for
example to retrieve a currency conversion rate.

It would be quite useful to be able to interact with
web services which use a more complex HTTP POST interface.
Can this be done, or is that possibly something for the
future?

Regards,
Brian
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