in reply to Can't locate object method "json_content"

Note the last line of the synopsis at LWP::UserAgent::JSON: 
 # $response->isa('HTTP::Response::JSON') if we got back JSON

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Have you checked whether $reponse->isa('HTTP::Response::JSON')? If it's not, what is it? It probably is a HTTP::Response object containing a response of a different content-type.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Seekers of Perl Wisdom