wp_remote_post response body is protected

I have made an API call with wp_remote_post and tried to retrieve the body with wp_remote_retrieve_body. But the response only showing headers and the body is protected.

below code, I have used to make an API call.

$args = array(
                'LocationId' => $loc_id,
                'AppId' => $app_id
               );
    $response = wp_remote_post( 'https://www.apiurl.com?APIKEY='."$api_key".'', $args );

$responceData = json_decode(wp_remote_retrieve_body( $response ), TRUE );
print_r($response);

and the printed response (just starting piece of data) is :

Array ( [headers] => Requests_Utility_CaseInsensitiveDictionary Object ( [data:protected]

I am developing the wordpress plugin in localhost. How to solve this error.

Full Response :

Array ( [headers] => Requests_Utility_CaseInsensitiveDictionary Object ( [data:protected] => Array ( [cache-control] => no-cache, no-store [pragma] => no-cache [content-type] => application/json; charset=utf-8 [expires] => -1 [server] => Microsoft-IIS/10.0 [access-control-allow-origin] => * [x-aspnet-version] => 4.0.30319 [x-powered-by] => ASP.NET [date] => Fri, 13 Jul 2018 06:24:16 GMT [content-length] => 1858 ) ) [body] => {"Already10Questions":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"AlreadyEmailErrorMessages":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"AuthorizationError":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"ErrorMessages":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"ExistPhoneNumber":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"SuccessMsg":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"UserRegisterSuccessmessages":{"Count":1,"ResponseErrors":[{"Already10Questions":null,"AlreadyEmailErrorMessage":null,"AuthorizationError":null,"CaseNo":"[180712-23:24:16]_3D94D663C0DB","ErrorMessage":null,"SuccessMsg":null,"UserRegisterSuccessMsg":null}]},"CheckUserLocationAccessByLocationIdList":null,"ItemsCount":0,"RestaurantTotalCountByFilterList":null,"appDetails":null}

UPDATE: Problem is solved with the below code. In my understanding, the problem is with sending arguments to the API in a wrong way. Thanks For Helping Sally Cj

$postData = array(
    'LocationId' => $loc_id,
    'AppId' => $app_id,
);
$context = array(
        'method' => 'POST',
        'headers' => "Authorization:\r\n".
            "Content-Type: application/json\r\n",
        'httpversion' => '1.0',
        'redirection' => 5,
        'timeout' => 60,
        'blocking' => true,
        'body' => json_encode($postData)
    );
            $response = wp_remote_post( 'apiurl.com?APIKEY='."$api_key".'', $context);
            $currency = wp_remote_post( 'apiurl.com?APIKEY='."$api_key".'', $context);

if ( is_wp_error( $response ) ) {
   $error_message = $response->get_error_message();
   echo "Something went wrong: $error_message";
} else {
    $responceData = json_decode(wp_remote_retrieve_body($response), true);
    $currencyData = json_decode(wp_remote_retrieve_body($currency), true);

The Problem

It's not about the response body being "protected". But you're not getting the expected response data because the request body was incomplete — i.e. it did not contain the data in $args (e.g. AppId).

Because $args is the request body; so it should be passed to wp_remote_post() like this:

$response = wp_remote_post( 'https://www.apiurl.com?APIKEY='."$api_key".'', array(
    'body' => $args
) );

See https://codex.wordpress.org/Function_Reference/wp_remote_post#Parameters

The Fixed Code

(Re-indented for clarity; and there were also other changes)

// Request body.
$body = array(
    'LocationId' => $loc_id,
    'AppId'      => $app_id
);
$response = wp_remote_post( 'https://www.apiurl.com?APIKEY='."$api_key".'', array(
    'body' => $body
) );

// Response body.
$body = wp_remote_retrieve_body( $response );

// On success (i.e. `$body` is a valid JSON string), `$responceData` would be an
// `ARRAY`.
$responceData = ( ! is_wp_error( $response ) ) ? json_decode( $body, true ) : null;
var_dump( $responceData );

Additional Note

Here, $responceData would be an array because you set the second parameter to true:

$responceData = json_decode(wp_remote_retrieve_body( $response ), TRUE );

So if you wanted $responceData to be an object, then simply omit the second parameter:

$responceData = json_decode(wp_remote_retrieve_body( $response ) );
//$responceData = json_decode(wp_remote_retrieve_body( $response ), false ); // equivalent to above

See the PHP manual for json_decode() for further details.