This template is ONLY for reporting security bugs. If you are reporting a
Download Protection Bypass bug, please use the "Security - Download
Protection" template. For all other reports, please use a different
template.

Please READ THIS FAQ before filing a bug: https://www.chromium.org/Home
/chromium-security/security-faq

Please see the following link for instructions on filing security bugs:
http://www.chromium.org/Home/chromium-security/reporting-security-bugs

NOTE: Security bugs are normally made public once a fix has been widely
deployed.

VULNERABILITY DETAILS
Please provide a brief explanation of the security issue.

When accessing an site that does not implement TLS, chrome shows Not Secure in the address bar (omnibox) as expected in the new version.
However, when accessing a non-encrypted site which is using a reverse proxy Chrome does not display this.

VERSION
Chrome Version: 56.0.2924.76  + stable
Operating System: Debian GNU/Linux 8.7 (jessie)
REPRODUCTION CASE
Please include a demonstration of the security bug, such as an attached
HTML or binary file that reproduces the bug when loaded in Chrome. PLEASE
make the file as small as possible and remove any content not required to
demonstrate the bug.

This can be reproduced by accessing a non-encrypted site and a site that is using a reverse proxy. In this test, Nginx was used. 

FOR CRASHES, PLEASE INCLUDE THE FOLLOWING ADDITIONAL INFORMATION
Type of crash: [tab, browser, etc.]
Crash State: [see link above: stack trace, registers, exception record]
Client ID (if relevant): [see link above]