Unable send test message on Rollbar

[0xkynz]

Hi,
My website: http://localhost/wordpress, when I click "Send test message to Rollbar" Button on rollbar setting. It appears:

There was a problem accessing Rollbar service.
Code: undefined
Message: undefined
I can not connect to the rollbar.

I found the problem:

rollbar-php-wordpress/public/js/RollbarWordpressSettings.js

Lines 98 to 116 in 81d487c

	logThroughPhp = function(config) {
	jQuery.post(
	"/index.php?rest_route=/rollbar/v1/test-php-logging",
	config,
	function(response) {
	if (response.err || response.code == 0) {
	phpFailNotice(response);
	} else {
	phpSuccessNotice();
	}
	}
	).fail(function(response) {
	phpFailNotice(response);
	});
	},

My solution:
We can use rest_url function to improve this.