Sample POST request with Guzzle

guzzle_post.php

<?php

require 'vendor/autoload.php';

use GuzzleHttp\Client;

$client = new Client([
  'base_uri' => 'http://example.com',
]);

$payload = file_get_contents('/my-data.xml');

$response = $client->post('the/endpoint', [
  'debug' => TRUE,
  'body' => $payload,
  'headers' => [
    'Content-Type' => 'application/x-www-form-urlencoded',
  ]
]);

$body = $response->getBody();
print_r(json_decode((string) $body));

Hi !

"body" param is deprecated in last version of Guzzle.

You must use "form_params" option to send a 'application/x-www-form-urlencoded' request
or the "multipart" request option to send a 'multipart/form-data' request.

Related: https://stackoverflow.com/a/34411797

What do do when you post other content?
e.g. "application/json"?
So neither a MIME-Multipart nor applicaton/form-data?

Set the header as "content-type" : "application/x-www-form-urlencoded" to accept form_params.