Blocking request in Chrome

Question

I\'m trying to block some requests in a Chrome app.

I created a JavaScript listener that does this validation:

Answer 1

It looks like you misunderstood the meaning of "blocking" here.

https://developer.chrome.com/extensions/webRequest.html#subscription

If the optional opt_extraInfoSpec array contains the string 'blocking' (only allowed for specific events), the callback function is handled synchronously. That means that the request is blocked until the callback function returns. In this case, the callback can return a BlockingResponse that determines the further life cycle of the request.

To block a request (cancel it), return {cancel: true} in your event handler.

For example:

chrome.webRequest.onBeforeRequest.addListener(
    function() {
        return {cancel: true};
    },
    {
        urls: ["*://site.com/test/*"]
    },
    ["blocking"]
);

This will block all URLs matching *://site.com/test/*.

Also remember to declare both webRequest and webRequestBlocking permissions in your manifest.