[ANSWERED]Laravel Guzzle Could Not Resolve Host

I have a Laravel application which is hosted locally on a local IP.
It will always be hosted internally on the IP.
I'm trying to connect my application to Interlinks API, on sending a $client->post() I get the following error:

ConnectException in CurlFactory.php line 186: cURL error 6: Could not resolve host: headers (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

Below is the code in my controller.

$client = new \GuzzleHttp\Client();

        $client->setDefaultOption('headers', array('Accept' => 'application/json', 'Content-Type' => 'application/json', 'GEOSESSION' => 'MTAuMjYuMy43asdasdasdasdTky'));
        $body = json_encode($job);

        $res = $client->post('https://api.interlinkexpress.com/shipping/shipment',['body' => $body]);

        dd($res);

Does anyone have any ideas why I get the could not resolve host? I'm hoping it's nothing to do with being local.
Thanks


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