Can't set Guzzle Content Type

Ok .. the problem was that I was setting body and headers outside of defautls. the solution is:

$client = new GuzzleHttp\Client(['base_url' => [$url, []],'defaults' => [     'auth' => [$publishable_key, ''],     'headers'  => ['content-type' => 'application/json', 'Accept' => 'application/json'],     'body' => json_encode($body),],]);

Guzzle 6

Guzzle will set the Content-Type header to application/x-www-form-urlencoded when no Content-Type header is already present.

You have 2 options.

Option 1: On the Client directly

$client = new GuzzleHttp\Client(    ['headers' => [        'Content-Type' => 'application/json'        ]    ]);

Option 2: On a Per Request basis

// Set various headers on a request$client = new GuzzleHttp\Client();$client->request('GET', '/whatever', [    'headers' => [        'Content-Type' => 'application/json'    ]]);

You can refer to Guzzle 6: Request Options

I was encountering the same issue with the Hubspot API that requires to set application/json as Content-Type for POST requests.

I fixed it this way

$client = new Client([    'base_uri' => 'https://api.hubapi.com/',    'timeout'  => 5,    'headers' => ['Content-Type' => 'application/json']]);

And then performing my requests the regular way

try{    $response = $client->request('POST', '/contacts/v1/contact/email/test@test.com/profile',    ['query' => MY_HUBSPOT_API_KEY, 'body' => $body]);}catch (RequestException $e) { print_r($e); }

I hope this helps.