Magento 2 rest api get params returns empty array

Question

Magento 2 rest api get params returns empty array can any one tell me where I am going wrong.

i/p: in postman body => raw => json
{
 "orderids":[1,2,3]
}

(or)

{
 "orderids":"1"
}

(or)

{
 "orderids":{
 "0":"1",
 "1":"1",
 "2":"1"
 }
}
<?php
namespace Test\OrderGridSync\Model;
use Test\OrderGridSync\Api\SyncInterface;
class Sync implements SyncInterface
{ 
protected $_request;
public function __construct(
 \Magento\Framework\App\Request\Http $request
) {
 $this->_request = $request;
}
/**
 * return order ids
 * @api
 * @param mix $orderids
 * @return mix 
 */
public function syncOrders() {
 print_r($this->_request->getParams());
 die('testing');
}
}

o/p:-

Array
(
)
testing

Answer 1

you have to pass data in parameters in POSTMAN like this and try to get the params in mentioned function

http://<host>/rest/V1/<endpoint>?orderids=[1,2,3]