How to use chrome extension chrome.proxy.settings.set API?

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Javascript

chrome

I read the doc and some SO posts, gist examples, this should be worked, but it does not work, I have no idea where is bad on the code.

The project is quite simple.

background.js

<code class="language-js">var config = {
  mode: "fixed_servers",
  rules: {
    proxyForHttp: {
      scheme: "http",
      host: "localhost",      
      port: 3138      
    },
  }
};
chrome.proxy.settings.set(
  {value: config, scope: 'regular'},
  function() {}
);


</code>

manifest.json

<code class="language-json">{
  "background": {
    "scripts": ["background.js"]
  },
 "browser_action": {
     "default_title": "chromeexttmp"
 },
 "name": "chromeexttmp",
 "permissions": [
     "tabs",
     "proxy",
     "<all_urls>",
     "unlimitedStorage",
     "storage",
     "webRequest",
     "webRequestBlocking"
 ],
 

 "version": "0.1",
 "manifest_version": 2
}


</code>

Of course, the proxy address localhost:3138 is working perfectly (I can confirm that on curl). Checking IP address on a website such as whatismyip, and the IP has not changed, going to the chrome URL chrome://net-internals/#proxy, there is no proxy settings showing up, and most strangely, there is no error messages on output/debug console. (if the bg.js has some kind of syntax error or something, at least I want some message or really cannot get what is happening behind..). So, what is wrong with my code?

Disclaimer: I'm new to Codeproject, kindly tell me I was wrong something. Thanks.

What I have tried:

I tried reading the document, searching for some SO posts and gist examples on the internet