Synchronous call in Google Chrome extension

Question

I\'m working on Google Chrome extension, which has to block/redirect some outgoing requests. For this purpose, I use chrome.webRequest.onBeforeRequest listener.

Answer 1

chrome.runtime.onMessage.addListener((message, rawSender, sendResponse) => {

        // here, you can call sendResponse method in any where asynchronous.

        return true;    // 这是重点，it's important
    }
);

// it also fit chrome.webRequest.onBeforeRequest.addListener