chrome.devtools.network

Description: Use the chrome.devtools.network API to retrieve the information about network requests displayed by the Developer Tools in the Network panel.
Availability: Since Chrome 18.

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.devtools.network.getHAR() method returns entire HAR log, while chrome.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.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.

Summary

Types
Request
Methods
getHAR chrome.devtools.network.getHAR(function callback)
Events
onRequestFinished
onNavigated

Types

Request

Represents a network request for a document resource (script, image and so on). See HAR Specification for reference.
methods

getContent

Request.getContent(function callback)

Returns content of the response body.

Parameters
function callback

A function that receives the response body when the request completes.

The callback parameter should be a function that looks like this:

function(string content, string encoding) {...};
string content

Content of the response body (potentially encoded).

string encoding

Empty if content is not encoded, encoding name otherwise. Currently, only base64 is supported.

Methods

getHAR

chrome.devtools.network.getHAR(function callback)

Returns HAR log that contains all known network requests.

Parameters
function callback

A function that receives the HAR log when the request completes.

The callback parameter should be a function that looks like this:

function(object harLog) {...};
object harLog

A HAR log. See HAR specification for details.

Events

onRequestFinished

Fired when a network request is finished and all request data are available.

addListener

chrome.devtools.network.onRequestFinished.addListener(function callback)
Parameters
function callback

The callback parameter should be a function that looks like this:

function( Request request) {...};
Request request

Description of a network request in the form of a HAR entry. See HAR specification for details.

onNavigated

Fired when the inspected window navigates to a new page.

addListener

chrome.devtools.network.onNavigated.addListener(function callback)
Parameters
function callback

The callback parameter should be a function that looks like this:

function(string url) {...};
string url

URL of the new page.