chrome/common/extensions/docs/templates/intros/devtools_network.html

   1 <p>
   2 See <a href="devtools">DevTools APIs summary</a> for
   3 general introduction to using Developer Tools APIs</a>.
   4 </p>
   5
   6 <h2 id="overview">Overview</h2>
   7
   8 <p>
   9 Network requests information is represented in the HTTP Archive format
  10 (<em>HAR</em>). The description of HAR is outside of scope of this document,
  11 please refer to <a href=
  12 "http://www.softwareishard.com/blog/har-12-spec/">
  13 HAR v1.2 Specification</a>.
  14 </p><p>
  15 In terms of HAR, the
  16 <code>chrome.devtools.network.getHAR()</code> method returns
  17 entire <em>HAR log</em>, while
  18 <code>chrome.devtools.network.onRequestFinished</code> event
  19 provides <em>HAR entry</em> as an argument to the event callback.
  20 </p>
  21 <p>Note that request content is not provided as part of HAR for efficieny
  22 reasons. You may call request's <code>getContent()</code> method to retrieve
  23 content.
  24 <p>If the Developer Tools window is opened after the page is loaded,
  25 some requests may be missing
  26 in the array of entries returned by <code>getHAR()</code>.
  27 Reload the page to get all requests.
  28 In general, the list of
  29 requests returned by <code>getHAR()</code> should match that displayed in
  30 the Network panel.
  31 <h2 id="overview-examples">Examples</h2>
  32
  33 <p>The following code logs URLs of all images larger than 40KB as they are
  34 loaded:</p>
  35
  36 <pre>
  37 chrome.devtools.network.onRequestFinished.addListener(
  38     function(request) {
  39       if (request.response.bodySize > 40*1024)
  40       chrome.experimental.devtools.console.addMessage(
  41           chrome.experimental.devtools.console.Severity.Warning,
  42           "Large image: " + request.request.url);
  43 });
  44 </pre>
  45
  46 <p>
  47 You can find more examples that use this API in
  48 <a href="samples#search:devtools.network">Samples</a>.
  49 </p>