Zend Framework 1.12 and 'ContextSwitch' helper

Question

I'm writing REST api and would like to return responses in JSON format. So, I read about about 'ContextSwitch'. But I can't make it to change headers to 'application/json' and convert data to json.

Here is code of my controller:

 public function preDispatch()
{

    $this->getRequest()->setParam('format', 'json');
    $this->_helper->layout()->disableLayout();
    $this->_helper->viewRenderer->setNoRender(true);
}


public function _init()
{

    $contextSwitch = $this->_helper->getHelper('contextSwitch');
    $contextSwitch ->addActionContext('post', 'json')
                    ->initContext('json');
}

public function postAction()
{
    echo 'test';

}

When I check response with Curl command line tool I received:

< Content-Length: 4
< Content-Type: text/html
< 
* Connection #0 to host localhost left intact
test* Closing connection #0

Why header and data are not changed? How can I fix it?

Answer 1

Looks like the _init() method is not executed at all. Try renaming it to init().