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<h1 class="page_title">chrome.devtools.network
API</h1>
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<!-- TABLE OF CONTENTS -->
<div id="toc">
<h2>Contents</h2>
<ol>
<li>
<a href="#H2-0">Overview</a>
<ol>
</ol>
</li><li>
<a href="#overview-examples">Examples</a>
<ol>
</ol>
</li>
<li>
<a href="#apiReference">API reference: chrome.devtools.network</a>
<ol>
<li>
<a href="#global-methods">Methods</a>
<ol>
<li>
<a href="#method-getHAR">getHAR</a>
</li>
</ol>
</li>
<li>
<a href="#global-events">Events</a>
<ol>
<li>
<a href="#event-onNavigated">onNavigated</a>
</li><li>
<a href="#event-onRequestFinished">onRequestFinished</a>
</li>
</ol>
</li>
<li>
<a href="#types">Types</a>
<ol>
<li>
<a href="#type-Request">Request</a>
<ol>
<li>
<a href="#global-Request-methods">Methods</a>
<ol>
<li>
<a href="#method-Request-getContent">getContent</a>
</li>
</ol>
</li>
</ol>
</li>
</ol>
</li>
</ol>
</li>
</ol>
</div>
<!-- /TABLE OF CONTENTS -->
<!-- Standard content lead-in for experimental API pages -->
<!-- STATIC CONTENT PLACEHOLDER -->
<div id="static"><!-- BEGIN AUTHORED CONTENT -->
<div id="pageData-name" class="pageData">chrome.devtools.network
API</div>
<p id="classSummary">
Use the <code>chrome.devtools.network</code> module to retrieve
the information about network requests displayed by the Developer Tools
in the Network panel.
</p><p>
See <a href="devtools.html">DevTools APIs summary</a> for
general introduction to using Developer Tools APIs.
</p>
<a name="H2-0"></a><h2>Overview</h2>
<p>
Network requests information is represented in the HTTP Archive format
(<em>HAR</em>). The description of HAR is outside of scope of this document,
please refer to <a href="http://www.softwareishard.com/blog/har-12-spec/">
HAR v1.2 Specification</a>.
</p><p>
In terms of HAR, the
<code>chrome.devtools.network.getHAR()</code> method returns
entire <em>HAR log</em>, while
<code>chrome.devtools.network.onRequestFinished</code> event
provides <em>HAR entry</em> as an argument to the event callback.
</p>
<p>Note that request content is not provided as part of HAR for efficieny
reasons. You may call request's <code>getContent()</code> method to retrieve
content.
</p><p>If the Developer Tools window is opened after the page is loaded,
some requests may be missing
in the array of entries returned by <code>getHAR()</code>.
Reload the page to get all requests.
In general, the list of
requests returned by <code>getHAR()</code> should match that displayed in
the Network panel.
</p><h2 id="overview-examples">Examples</h2>
<p>The following code logs URLs of all images larger than 40KB as they are
loaded:</p>
<pre>chrome.devtools.network.onRequestFinished.addListener(
function(request) {
if (request.response.bodySize &gt; 40*1024)
chrome.experimental.devtools.console.addMessage(
chrome.experimental.devtools.console.Severity.Warning,
"Large image: " + request.request.url);
});
</pre>
<p>
You can find more examples that use this API in
<a href="samples.html#devtools.network">Samples</a>.
</p>
<!-- END AUTHORED CONTENT -->
</div>
<!-- API PAGE -->
<div class="apiPage">
<a name="apiReference"></a>
<h2>API reference: chrome.devtools.network</h2>
<!-- PROPERTIES -->
<!-- /apiGroup -->
<!-- METHODS -->
<div id="methodsTemplate" class="apiGroup">
<a name="global-methods"></a>
<h3>Methods</h3>
<!-- iterates over all functions -->
<div class="apiItem">
<a name="method-getHAR"></a> <!-- method-anchor -->
<h4>getHAR</h4>
<div class="summary">
<!-- Note: intentionally longer 80 columns -->
<span>chrome.devtools.network.getHAR</span>(<span class="null"><span>function</span>
<var><span>callback</span></var></span>)</div>
<div class="description">
<p>Returns HAR log that contains all known network requests.</p>
<!-- PARAMETERS -->
<h4>Parameters</h4>
<dl>
<div>
<div>
<dt>
<var>callback</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>function</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>A function that receives the HAR log when the request completes.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div>
</dl>
<!-- RETURNS -->
<dl>
</dl>
<!-- CALLBACK -->
<div>
<div>
<h4>Callback function</h4>
<p>
The callback <em>parameter</em> should specify a function
that looks like this:
</p>
<!-- Note: intentionally longer 80 columns -->
<pre>function(<span>object harLog</span>) <span class="subdued">{...}</span>;</pre>
<dl>
<div>
<div>
<dt>
<var>harLog</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>object</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>A HAR log. See HAR specification for details.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div>
</dl>
</div>
</div>
<!-- MIN_VERSION -->
</div> <!-- /description -->
</div> <!-- /apiItem -->
</div> <!-- /apiGroup -->
<!-- EVENTS -->
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<a name="global-events"></a>
<h3>Events</h3>
<!-- iterates over all events -->
<div class="apiItem">
<a name="event-onNavigated"></a>
<h4>onNavigated</h4>
<div class="summary">
<!-- Note: intentionally longer 80 columns -->
<span class="subdued">chrome.devtools.network.</span><span>onNavigated</span><span class="subdued">.addListener</span>(function(<span>string url</span>) <span class="subdued">{...}</span><span></span>);
</div>
<div class="description">
<p>Fired when the inspected window navigates to a new page.</p>
<!-- LISTENER PARAMETERS -->
<div>
<h4>Listener parameters</h4>
<dl>
<div>
<div>
<dt>
<var>url</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>string</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>URL of the new page.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div>
</dl>
</div>
<!-- EXTRA PARAMETERS -->
<!-- LISTENER RETURN VALUE -->
<dl>
</dl>
</div> <!-- /description -->
</div><div class="apiItem">
<a name="event-onRequestFinished"></a>
<h4>onRequestFinished</h4>
<div class="summary">
<!-- Note: intentionally longer 80 columns -->
<span class="subdued">chrome.devtools.network.</span><span>onRequestFinished</span><span class="subdued">.addListener</span>(function(<span>Request request</span>) <span class="subdued">{...}</span><span></span>);
</div>
<div class="description">
<p>Fired when a network request is finished and all request data are available.</p>
<!-- LISTENER PARAMETERS -->
<div>
<h4>Listener parameters</h4>
<dl>
<div>
<div>
<dt>
<var>request</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<a href="devtools.network.html#type-Request">Request</a>
</span>
</span>
)
</div>
</em>
</dt>
<dd>Description of a network request in the form of a HAR entry. See HAR specification for details.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div>
</dl>
</div>
<!-- EXTRA PARAMETERS -->
<!-- LISTENER RETURN VALUE -->
<dl>
</dl>
</div> <!-- /description -->
</div> <!-- /apiItem -->
</div> <!-- /apiGroup -->
<!-- TYPES -->
<div class="apiGroup">
<a name="types"></a>
<h3 id="types">Types</h3>
<!-- iterates over all types -->
<div class="apiItem">
<a name="type-Request"></a>
<h4>Request</h4>
<div>
<dt>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>object</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>Represents a network request for a document resource (script, image and so on). See HAR Specification for reference.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<dd>
<div class="apiGroup">
<a name="global-Request-methods"></a>
<h3>Methods of Request</h3>
<!-- iterates over all functions -->
<div class="apiItem">
<a name="method-Request-getContent"></a> <!-- method-anchor -->
<h4>getContent</h4>
<div class="summary">
<!-- Note: intentionally longer 80 columns -->
<span>request.getContent</span>(<span class="null"><span>function</span>
<var><span>callback</span></var></span>)</div>
<div class="description">
<p>Returns content of the response body.</p>
<!-- PARAMETERS -->
<h4>Parameters</h4>
<dl>
<div>
<div>
<dt>
<var>callback</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>function</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>A function that receives the response body when the request completes.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div>
</dl>
<!-- RETURNS -->
<dl>
</dl>
<!-- CALLBACK -->
<div>
<div>
<h4>Callback function</h4>
<p>
The callback <em>parameter</em> should specify a function
that looks like this:
</p>
<!-- Note: intentionally longer 80 columns -->
<pre>function(<span>string content, string encoding</span>) <span class="subdued">{...}</span>;</pre>
<dl>
<div>
<div>
<dt>
<var>content</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>string</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>Content of the response body (potentially encoded).</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div><div>
<div>
<dt>
<var>encoding</var>
<em>
<!-- TYPE -->
<div style="display:inline">
(
<span id="typeTemplate">
<span>
<span>string</span>
</span>
</span>
)
</div>
</em>
</dt>
<dd>Empty if content is not encoded, encoding name otherwise. Currently, only base64 is supported.</dd>
<!-- OBJECT PROPERTIES -->
<!-- OBJECT METHODS -->
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div>
</dl>
</div>
</div>
<!-- MIN_VERSION -->
</div> <!-- /description -->
</div> <!-- /apiItem -->
</div>
</dd>
<!-- OBJECT EVENT FIELDS -->
<!-- FUNCTION PARAMETERS -->
</div>
</div> <!-- /apiItem -->
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