Can't set Guzzle Content Type - php

Question

I'm trying to request this way:
$body = [];
$body['holder_name'] = $full_name;
$body['bank_code'] = $bank_number;
$body['routing_number'] = $branch_number;
$body['account_number'] = $account_number;
$body['type'] = 'checking';
$client = new GuzzleHttp\Client([
'base_url' => [$url, []],
'headers' => ['content-type' => 'application/json', 'Accept' => 'application/json'],
'defaults' => [
'auth' => [$publishable_key, ''],
],
'body' => json_encode($body),
]);
The problem is that this request is being set without Content-Type.
What am I doing wrong?

Answer 1

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),
],
]);

Answer 2

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

Answer 3

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.