How to modify URL through chrome.webRequest.onBeforeRequest?

[Mystic]

I'm writing an expansion for the browser chromium and trying to change. part URL In GET. But I don't understand how to return the modified parameter? It's important that only change. parameter in URLand the rest of the heds stayed.

I need to change the part.blablaOn "stopbla" For example:

Do--

What am I doing wrong?

background.js (part)

    var callback = function (details) {
    if (details.url.indexOf('blabla') > -1) {
    bkg.console.log('++ Yes: ' + JSON.stringify(details.url));
    details.url = details.url.replace('blabla', 'stopbla');
}

return {url: details.url};

};

var filter = {urls: ["http:///", "https:///"], tabId: currentTabId};

var opt_extraInfoSpec = ['requestBody', "blocking"];
chrome.webRequest.onBeforeRequest.addListener(

callback, filter, opt_extraInfoSpec);

manifest.json (part)

"permissions": [ "tabs","background", "webRequest", "webRequestBlocking", ":///"],

"background": {"scripts": ["background.js"]},

[inna]

The method of sampling and error, it's the solution.

In the parameter, only 'blocking' And nothing else! It's important!

var opt_extraInfoSpec = ['blocking'];

The following method shall be used:

chrome.webRequest.onBeforeRequest.addListener

And callback. redirectUrl c modified URL:

return {redirectUrl: modified_url?