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my $res = $ua->request(POST $url,
                           content-type  => 'form-data',
                           content       => $query,
                           authorization => "Basic " . AUTHORISATION,
);

my $res = $ua->request(POST $url,
            [    
...
                "content"       => $query,
                "authorization" => "Basic " . AUTHORISATION
            ]);