The body parameter is respected for both POST and GET eventhough the API says it is only for POST
But this parameter is now useful only if you know the oldid. While requesting HTML for latest revision without oldid, like:
http://parsoid-lb.eqiad.wikimedia.org/enwiki/Who_Wants_to_Be_a_Superhero%3F?body=1
It get redirected to
http://parsoid-lb.eqiad.wikimedia.org/enwiki/Who_Wants_to_Be_a_Superhero%3F?oldid=651259373 without keeping the body parameter