Use the chrome.experimental.devtools.network module to retrieve the information about network requests displayed by the Developer Tools in the Network panel.

See DevTools APIs summary for general introduction to using Developer Tools APIs.

Overview

Network requests information is represented in the HTTP Archive format (HAR). The description of HAR is outside of scope of this document, please refer to HAR v1.2 Specification.

In terms of HAR, the chrome.experimental.devtools.network.getHAR() method returns entire HAR log, while chrome.experimental.devtools.network.onRequestFinished event provides HAR entry as an argument to the event callback.

Note that request content is not provided as part of HAR for efficieny reasons. You may call request's getContent() method to retrieve content.

If the Developer Tools window is opened after the page is loaded, some requests may be missing in the array of entries returned by getHAR(). Reload the page to get all requests. In general, the list of requests returned by getHAR() should match that displayed in the Network panel.

Examples

The following code logs URLs of all images larger than 40KB as they are loaded:

chrome.experimental.devtools.network.onRequestFinished.addListener(
    function(request) {
      if (request.response.bodySize > 40*1024)
      chrome.experimental.devtools.console.addMessage(
          chrome.experimental.devtools.console.Severity.Warning,
          "Large image: " + request.request.url);
});

You can find more examples that use this API in Samples.