This is a weird way of passing parameters.
As discussed in rcaputo's reply and the link(s) therefrom, it is another (and exactly equivalent) way of writing
$kernel->post('ua', 'request', 'got_response', GET $url);
except, IMO, less messy (for some definition of 'mess') and distracting.
Another manifestation of this idiom is in the quasi-self-documentating
return bless $objref => $class;
which one might find in an object constructor and which might be read as 'bless object reference into class'.
In reply to Re: Strange POE parameters
by AnomalousMonk
in thread Strange POE parameters
by brunnock
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