Drupal7 REST: I am not able to perform POST and PUT methods. Error is :Not Acceptable : Node type is required, Code:406? - rest

Question

I'm using drupal7. my drupal_http_request() for get and delete are working fine for authenticated users, but the post and put methods are not working.
The error is :Not Acceptable : Node type is required, and http error code is :406. My code is below:
function ws_form_post_auth() {
$base_url = 'http://localhost/drupalws/api/v1';
$data = array(
'username' => 'student1',
'password' => 'welcome',
);
$data = http_build_query($data, '', '&');
$options = array(
'headers' => array(
'Accept' => 'application/json',
),
'method' => 'POST',
'data' => $data
);
$response = drupal_http_request($base_url . '/user/login', $options);
$data = json_decode($response->data);
// Check if login was successful
if ($response->code == 200) {
$options['headers']['Cookie'] = $data->session_name . '=' . $data->sessid;
$options['headers']['X-CSRF-Token'] = $data->token;
$data = array(
'title' => 'First forum post',
'type'=> 'forum',
'body'=> array(
'und'=>array(
0=> array(
'value'=>'This is my first forum post via httprequest.'
)
)
)
);
$data = json_encode($data);
$options['data'] = $data;
$options['method'] = 'POST';
$response = drupal_http_request($base_url . '/node', $options);
return $response->status_message;
}
return $response->status_message;
}

Answer 1

I got the solution for my issue,I just missed a Content-Type in Headers.
[....]
if ($response->code == 200) {
$options['headers']['Cookie'] = $data->session_name . '=' . $data->sessid;
$options['headers']['X-CSRF-Token'] = $data->token;
$options['headers']['Content-Type'] = 'application/json';
[....]