title: Can’t submit data to API Platform
body: <p>I have a controller through which I send data to my local environment of the api platform (which is running fine)</p>
  
  <pre><code>    /**
       * Creates a new Location entity.
       *
       */
      public function createAction(Request $request)
      {
          $this-&gt;get("suvya_breadcrumbs.factory")-&gt;update('New Hub');
  
          $form = $this-&gt;createForm(HubType::class);
          $form-&gt;handleRequest($request);
  
          $new_url = $this-&gt;generateUrl('new_hub');
          $redirect_url = $this-&gt;generateUrl('home');
  
          if ($form-&gt;isSubmitted() &amp;&amp; $form-&gt;isValid()) {
  
              $client = new Client([
                  'base_uri' =&gt; 'http://127.0.0.1:8000',
              ]);
  
              $response = $client-&gt;request('POST', '/hubs', [
                  'form_params'=&gt; $form-&gt;getData(),
                  'headers' =&gt; [
                      'Accept'     =&gt; 'application/ld+json',
                      'Content-Type'=&gt; 'application/json',
                      'Authorization'=&gt; 'eyJhbGciOiJSUzI1NiJ9.eyJyb2xlcyI6WyJST0xFX1VTRVIiXSwidXNlcm5hbWUiOiJhZG1pbiIsImlhdCI6MTUxNzg3NjE1NCwiZXhwIjoxNTE3ODc5NzU0fQ.gIG9lueJJZxzkOl8qblhHWwiJvW97m4gz1-1mYeM9SgMzMW35Wh6XamOOYiISDN99yJ6Ovo-wKk6whpE5UGMDVw_wGek003Dd6r-Y7Ql3kVLHksn2JFzhAN3GwlXFcOI4MIjmq5qBhkzv21pHymO0yn1SlzWBwb0O7WygywefMu5p09zGuvAiP9I2ShyQLZhjj8bB_odf3dI-Ql0ZbRmn_JDkDoPcm5U11i-3S1oMikBmFq0WtTcWo7vezt3QdA3bY4_bgaISINAiYRR-_cvjpBSqFSE6n1ZYtHvKFn-98wXXsBGxEAoZw6iQL4iRgOI8F_uaiCo0eRHC7q0_xQ_V_W0-5XDIQXWDwoiVaUXnjO6xo2Fldp7PLO1ueJz1e4wiOy2-TunZdc8UCtw2BdFIQtWatPLi_v_rsNvF2H-6hwa9UOKEi9Z4tH4KkuATbXAxxfkCbSOyY1SAWP0riooPQi_AI2J7L2Ly86eAuKo1Hix3EuEogo19GSyBz_cCWczyERQWM9gikuUs8E22SIAdxTl8ZLFaXgiZIibDvb8pqcN8izFjywWbF2CkyWC58WxrVd6Bfmfnm7k9T6oZqwIZ-TQR-SbRnUHN1hpWUjFCk-tHhgvh7osHXmxe3grzA8M3LPBpQGQiTeqBZFMjF4Tx8zW2tuiEn6TwhV14Lj24Vc'
                  ]
              ]);
  
              die();
          }
  
          return $this-&gt;render('SuvyaFabricsCloudBundle:Common:basic.html.twig', array(
              'form' =&gt; $form-&gt;createView(),
              'page_title'=&gt; 'Hub aanmaken',
              'action_path' =&gt; $new_url,
              'cancel_path'=&gt; $redirect_url,
              'submit_button_title'  =&gt; 'Opslaan',
          ));
      }
  </code></pre>
  
  <p>But unfortunately i'm getting an error in my dev.log of the api environment:</p>
  
  <pre><code>[2018-02-06 02:32:37] request.INFO: Matched route "api_hubs_post_collection". {"route":"api_hubs_post_collection","route_parameters":{"_controller":"api_platform.action.post_collection","_format":null,"_api_resource_class":"AppBundle\\Entity\\Hub","_api_collection_operation_name":"post","_route":"api_hubs_post_collection"},"request_uri":"http://127.0.0.1:8000/hubs","method":"POST"} []
  [2018-02-06 02:32:37] request.CRITICAL: Uncaught PHP Exception Symfony\Component\Serializer\Exception\UnexpectedValueException: "Syntax error" at /Users/myname/Sites/suvyalogistics-api/vendor/symfony/symfony/src/Symfony/Component/Serializer/Encoder/JsonDecode.php line 78 {"exception":"[object] (Symfony\\Component\\Serializer\\Exception\\UnexpectedValueException(code: 0): Syntax error at /Users/myname/Sites/suvyalogistics-api/vendor/symfony/symfony/src/Symfony/Component/Serializer/Encoder/JsonDecode.php:78)"} []
  </code></pre>
  
  <p>The output of form->getData():</p>
  
  <pre><code>array (size=4)
    'postalCode' =&gt; string 'sdfdsf' (length=6)
    'streetName' =&gt; string 'sdfsdf' (length=6)
    'doorNumber' =&gt; string 'sdfsfd' (length=6)
    'city' =&gt; string 'sdfsfd' (length=6)
  </code></pre>
  
  <p>Running the endpoint at the api platform with the same values goes fine as well. </p>
  
  <p>Does anyone of you has an idea why this goes wrong?</p>