Guzzle sends request without body

[toh82]

It seems this is a bit outdated:

MelissaAddressValidator/Controller/Address/Validate.php

Line 161 in 0719825

'json' => $params

            $request = $client->request(
                Request::HTTP_METHOD_POST,
                self::API_REQUEST_ENDPOINT,
                [
                    'json' => $params
                ]
            );

if I run this, the body for the request within \GuzzleHttp\Client::requestAsync is always empty because it can't find $options['body'] also there it tries to set the headers which are empty, too $headers = $options['headers'] ?? [];

Besides this, currently the request to Melissa, even if the above is adjusted, returns GE08 (my API Key is actually allowed to do the request, we checked the config) so I wonder if the request has an additional problem somewhere.

I adjusted the code above like this, dunno is it's completely correct

            $request = $client->request(
                Request::HTTP_METHOD_POST,
                self::API_REQUEST_ENDPOINT,
                [
                    'headers' => [
                        'Accept' => 'application/json'
                    ],
                    'body' => json_encode($params)
                ]
            );

[toh82]

I allowed me to create a pull request for this
#3