Why http request with Guzzle doesn't work? - php

Question

I'm developing a website with Laravel 5.7 that has a registration form. When the form is submitted, its params are used to create another user via API.
These API have a .cloudfunctions.net endpoint and the web application is developed using Angular + Firebase.
When I make a GuzzleHttp request to that endpoint, I receive back an HTML response: the google account login page.
The strange thing is that when I run the corresponding cURL command from my vagrant console, or I run the same request with Postman, it returns me a correct json response.
This is a cURL example command:
curl -d '{DATA}' -H "Content-Type: application/json" -u test:test -X POST https://{endpoint}.cloudfunctions.net/api/{function}
And this is my ApiManager class in Laravel project:
namespace App\Utils;
use GuzzleHttp\Client;
/**
* API Manager class.
*/
class ApiManager
{
protected $client;
protected $params;
protected $body;
public function __construct()
{
$this->setupClient();
}
/**
* Setup GuzzleHttp client.
* #return void
*/
private function setupClient()
{
$this->client = new Client([
'base_uri' => env('REMOTE_ENDPOINT'),
'auth' => [env('REMOTE_USERNAME'), env('REMOTE_PASSWORD')],
'headers' => [
'Accept' => 'application/json'
],
'strict' => true
]);
}
/**
* Setup request body as json.
* http://docs.guzzlephp.org/en/stable/request-options.html#json
*
* #param array $params
* #return void
*/
protected function setupBody($params)
{
$this->body = [
'debug' => env('GUZZLE_DEBUG', false),
'json' => $params
];
}
/**
* Decode raw json body to associative array
*
* #param mixed $response
* #return void
*/
protected function getResponseBody($response)
{
$body = json_decode($response->getBody(), true);
if ($body != null && array_key_exists('error', $body)) {
return $body['error'];
}
return $body;
}
/**
* Create user request.
*
* #param array $params
* #return mixed $response
*/
public function createUser($params)
{
$this->setupBody($params);
$response = $this->client->request('POST', '/create-user', $this->body);
if ($response->getStatusCode() == 200) {
return $this->getResponseBody($response);
}
return false;
}
/**
* Update user request.
*
* #param array $params
* #return mixed $response
*/
public function updateUser($params)
{
$this->setupBody($params);
$response = $this->client->request('POST', '/update-user', $this->body);
if ($response->getStatusCode() == 200) {
return $this->getResponseBody($response);
}
return false;
}
}
Anyone can help me find why Guzzle returns the Google account login page, while Postman or cURL from command line work?
Thanks in advance