Laravel 5 response isn't right

I've built a small Laravel project to get data from an open API and return it with the right CORS headers and such. So I'm doing this:

$client = new Client();
$res = $client->get('http://ift.tt/2sG87Wk' . $call);
return response()->json(json_decode($res->getBody()))->withHeaders($res->getHeaders());

When I make an example call, it returns a weird response, starting with <?php followed by the actual JSON response. Why does this happen?

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