Fired when a network request has finished and its details are available to the extension.

The request is given as a HAR entry object, which is also given an asynchronous getContent() method that gets the response body content.

Note that although your extension can add a listener at any time, it will only start firing after the user has activated the browser's network panel at least once.



Events have three functions:


Adds a listener to this event.


Stop listening to this event. The listener argument is the listener to remove.


Check whether listener is registered for this event. Returns true if it is listening, false otherwise.

addListener syntax



The function called when this event occurs. The function is passed this argument:


object. An object representing the request. This object is a single HAR entry object. It also defines an asynchronous getContent() method, which returns a Promise that resolves with an array of two elements. The first element is the HTTP response body as a string, while the second element is the MIME type of the HTTP response also as a string.

Browser compatibility

BCD tables only load in the browser


Add a listener that logs the server IP address and response body for every network request.

function handleRequestFinished(request) {
  console.log("Server IP: ", request.serverIPAddress);
  request.getContent().then(([content, mimeType]) => {
    console.log("Content: ", content);
    console.log("MIME type: ", mimeType);

Note: This API is based on Chromium's chrome.devtools API.