Accept request headers are "text/html,application/xhtm ...(etc)" when I want "application/json" in zf2 client code
<p>I've got a fully working API set up, and the zf2 client I have set up works in theory, but no matter what, I can't seem to send a JSON request from my client to the API. Whenever I test it I keep getting the following headers which in turn return a 406 error:</p>

<pre><code>Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.5
Connection: keep-alive
Host: zf2-client.local
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0 FirePHP/0.7.4
x-insight: activate
</code></pre>

<p>Now here's the class I'm using for this and the following is my request setup method. I have done some trials to get the headers in there, but they just don't work and i can't figure out why. As I said the API I'm consuming usually returns a perfectly fine json script, but right now it seems the headers are making it impossible for me to get the necesary information.</p>

<pre><code>protected static function doRequest($url, array $postData = null, $method = Request::METHOD_GET)
{
    $client = self::getClientInstance();
    $client-&gt;setUri($url);
  /*
 Third attempt Also Didn't work

 $client
     -&gt;setHeaders([
     'Content-Type' =&gt; 'application/json',
     ])
     -&gt;setOptions(['sslverifypeer' =&gt; false])
     -&gt;setMethod('POST')
     -&gt;setRawBody(Json::encode($params));
   */
  $client-&gt;setMethod($method);


  /* 
 seccond attempt still not working

 $client-&gt;setHeaders(array(
 Zend\Http\Header\Accept::fromString('Accept: application/json'),
 'Accept-Encoding' =&gt; 'json',
 'X-Powered-By: Zend Framework',
 ));
  */

  //first attempt at adding a working application/json header      
  // $acceptHeader = Zend\Http\Header\Accept::fromString('Accept: application/json');
  //$client-&gt;getHeaders()-&gt;addHeader($acceptHeader);

    if ($postData !== null) {
        $client-&gt;setParameterPost($postData);
    }

    $response = $client-&gt;send();

    if ($response-&gt;isSuccess()) {
        return JsonDecoder::decode($response-&gt;getBody(), Json::TYPE_ARRAY);
    } else {
        $logger = new Logger;
        $logger-&gt;addWriter(new Stream('data/logs/apiclient.log'));
        $logger-&gt;debug($response-&gt;getBody());
        return FALSE;
    }
}
</code></pre>

<p>Any and all help is welcome. Thank you for your time and effort :)</p>