HTTP/1.1 502 Proxy Error
Content-Length: 407
Connection: close
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>502 Proxy Error</title>
</head><body>
<h1>Proxy Error</h1>
<p>The proxy server received an invalid
response from an upstream server.<br />
The proxy server could not handle the request <em><a href="/proxy/test.txt">GET&nbsp;/proxy/test.txt</a></em>.<p>
Reason: <strong>Error reading from remote server</strong></p></p>
</body></html>
- Peer has closed the GnuTLS connection
