How to get html code ，i ‘m using QwebEngineView

THEFree

Excuse me，I am using PyQt5 QwebEngineView, how to get the html code.
for example:

<!doctype html>
<html>
        <head>
                <meta charset="utf-8">
                <meta http-equiv="X-UA-Compatible" content="IE=edge">
                <meta name="renderer" content="webkit">
                <title></title>
                <link rel="shortcut icon" href="/static/favicon.ico" type="image/x-icon" />
                <link href="/static/bootstrap-3.3.5/css/bootstrap.min.css" rel="stylesheet">
                <link href="/static/css/site.css?date=20180912" rel="stylesheet">
                <link href="/static/codemirror/lib/codemirror.css" rel="stylesheet">
                <!--[if lte IE 9]>
                <script src="/static/js/requestAnimationFrame.js"></script>
                <![endif]-->
        </head>
        <body>
       .....

(from google translation)