chrome.runtime.onMessage.addListener(function(request, sender, response) {
	
chrome.runtime.onMessage.addListener(
function (request, sender, sendResponse) {
     console.log(sender.tab ?
     "from a content script:" + sender.tab.url :
     "from the extension");
     if (request.greeting == "hello")
     sendResponse({ farewell: "goodbye" });
});
		const xhr = new XMLHttpRequest();
		const method = request.method ? request.method.toUpperCase() : "GET";
		xhr.open(method, request.url, true);
		xhr.onload = () => response(xhr.responseText);
		xhr.onerror = () => response(xhr.statusText);
		if (method == "POST") {
			xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		}
		xhr.send(request.data);
		return true;
});