Tests XHR network resource type and content for synchronous requests. Bug 61205
http://127.0.0.1:8000/devtools/network/resources/resource.php
resource.type: xhr
resource.content after requesting content: Hello world
Tests XHR network resource type and content for synchronous requests. Bug 61205
http://127.0.0.1:8000/devtools/network/resources/resource.php
resource.type: xhr
resource.content after requesting content: Hello world