content has protect access in http-foundation/Request

[moeen-basra]

In the function below
`public function singleRequest($method, $uri, array $data = [], array $headers = [], $content = null)
{
// Save the current request so we can reset the router back to it
// after we've completed our internal request.
$currentRequest = $this->request->instance()->duplicate();

    dd($currentRequest->content, $currentRequest->getContent());

    $headers = $this->overrideHeaders($currentRequest->server->getHeaders(), $headers);

    if ($this->disableMiddleware) {
        $this->app->instance('middleware.disable', true);
    }

    $response = $this->request($method, $uri, $data, $headers, $content);

    if ($this->disableMiddleware) {
        $this->app->instance('middleware.disable', false);
    }

    // Once the request has completed we reset the currentRequest of the router
    // to match the original request.
    $this->request->instance()->initialize(
        $currentRequest->query->all(),
        $currentRequest->request->all(),
        $currentRequest->attributes->all(),
        $currentRequest->cookies->all(),
        $currentRequest->files->all(),
        $currentRequest->server->all(),
        $currentRequest->content
    );

    return $response;
}`

We may need to change

$currentRequest->content
to
$currentRequest->getContent()