Rise exception when service response is not valid
Description
E.g. ServiceNow returns something like the following:
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<!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html>
<head>
<title>
Hibernating Instance
</title>
<meta HTTP-EQUIV="refresh" content="3;https://developer.servicenow.com/app.do#!/instance?wu=true">
</head>
<body>
<div style="width:100%; height:55px;background:#333;">
<a href="https://developer.servicenow.com/app.do#!/home">
<img id="dev-logo" src="devportal-logo.png" style="width: 300px;padding: 10px;" alt="ServiceNow Developers">
</a>
</div>
<div style="text-align: center;padding: 30px 10px 10px; 10px;">
<p style="font-size:27px;line-height:38px;color:#333;">Sorry, I got bored and fell asleep. Sign in to the <a style="color:#428bca;text-decoration: none;" href="https://developer.servicenow.com/app.do#!/instance?wu=true">Developer Site</a> and I will be ready to report for duty!
<br/>Examine the <a style="color:#428bca;text-decoration: none;" href="https://developers.servicenow.com/app.do#!/program/faq?q=sleepy_personal_peveloper_instances">FAQ</a> to learn more about sleepy instances.</p>
</div>
<div style="text-align: center;">
<img src="dev-power-off.png" width="160px" height="160px" />
</div>
<div style="text-align: center;padding: 20px 10px;">
<p style="font-size:16px;color:#333;">You will be redirected momentarily to the <a style="color:#428bca;text-decoration: none;" href="https://developer.servicenow.com/app.do#!/instance?wu=true" >Developer Site</a>.
</p>
</div>
</body>
</html>when target dev instance is "sleeping".
Environment
None
