Magento 2.1: Do we need to do anything special for the controll action to accept HTTP Post with Json Payload?

Question

I have a controller action that will be used for webhook handler.

When I did the form post to that URL with header content-type:

application/x-www-form-urlencoded

My load is:

MyVariableOne=ValueOne&MyVariableTwo=ValueTwo

On the action's execute function, I had $data as

$data = $this->getRequest()->getPostValue();

When I do var_dump, I got:

array(2) { ["MyVariableOne"]=> string(8) "ValueOne" ["MyVariableTwo"]=> string(8) "ValueTwo" }

But when I change the content-type to application/json and set payload to:

{"MyVariableOne":"ValueOne","MyVariableOne":"ValueTwo"}

the var_dump now become:

array(0) { }

Am I missing some steps to make my webhook hanlder support

Thank you,

Answer 1

Turned out JSON Payload doesn't like to be mapped by $this->getRequest()->getPostValue(); Instead I have to fall back to primitive PHP command.

$request_body = file_get_contents('php://input');

$data = json::decode($request_body,true);