Why does chrome.webRequest.OnBeforeRequest fire before chrome.webNavigation.onBeforeNavigate? -

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i'm trying understand logic. in mind, onbeforenavigate event should complete before hear request. find onbeforerequest event fires first. here's sample code demonstrate mean.

test.js

function test(url) {   chrome.tabs.create({ url: "" }, function (tab) {     chrome.webnavigation.onbeforenavigate.addlistener(function (details) {       console.log("chrome.webnavigation.onbeforenavigate hit on " + details.timestamp);     });      chrome.webrequest.onbeforerequest.addlistener(function (details) {       console.log("chrome.webrequest.onbeforerequest hit on " + details.timestamp);     }, {       tabid: tab.id,       urls: ["<all_urls>"]     });      chrome.tabs.update(tab.id, {       url: url     });   }); } test("http://www.steam.com");    // simple url 2 requests

resulting console messages:

chrome.webrequest.onbeforerequest hit on 1437083141916.896 chrome.webnavigation.onbeforenavigate hit on 1437083141916.906 chrome.webrequest.onbeforerequest hit on 1437083141940.385

manifest.json

{   "background": {     "persistent": true,     "scripts": [       "test.js"     ]   },   "manifest_version": 2,   "name": "test",   "permissions": [     "<all_urls>",     "webnavigation",     "webrequest"   ],   "version": "1.0" }

here view of 3 details, in order of event fire:

// first chrome.webrequest.onbeforerequest {   "frameid" : 0,   "method" : "get",   "parentframeid" : -1,   "requestid" : "72285",   "tabid" : 1312,   "timestamp" : 1437083141916.896,   "type" : "main_frame",   "url" : "http://www.steam.com/" },  // chrome.webnavigation.onbeforenavigate {   "frameid" : 0,   "parentframeid" : -1,   "processid" : 3567,   "tabid" : 1312,   "timestamp" : 1437083141916.906,   "url" : "http://www.steam.com/" },  // second chrome.webrequest.onbeforerequest {   "frameid" : 0,   "method" : "get",   "parentframeid" : -1,   "requestid" : "72286",   "tabid" : 1312,   "timestamp" : 1437083141940.385,   "type" : "image",   "url" : "http://www.steam.com/images/pipebackwhite.gif" }

if think when each event firing should make sense.

onbeforerequest firing before make request server:

fires when request occur. event sent before tcp connection made , can used cancel or redirect requests.

on other side, onbeforenavigate fires before page navigates next page:

fired when navigation occur.

if think how browser works, fires request server , if it's typical get, browser navigates new page on request based off of headers. however, happens on actual request, , onbeforerequest being run before fires off server @ all.

so, make request, api says:

  • a request made, before anything, should fire onbeforerequest
  • ok, processed request, it's making me navigate/redirect, before that, should onbeforenavigate

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