Bug#710056: security-tracker: some release pages fail to display with "Proxy Error"

["Francesco Poli \(wintermute\)" <invernomuto@paranoici.org>]

Package: security-tracker
Severity: important

Hello everybody.
I've just noticed that some release pages no longer work and return
a "Proxy Error" instead.
For instance:
https://security-tracker.debian.org/tracker/status/release/unstable?show_undetermined_urgency=1

currently displays:

| Proxy Error
| 
| The proxy server received an invalid response from an upstream server.
| The proxy server could not handle the request GET /tracker/status/release/unstable.
| 
| Reason: Error reading from remote server
| 
| Apache Server at security-tracker.debian.org Port 443

Other similar release pages (with URL parameters) suffer from the same
issue.

What's wrong?
Could you please investigate and fix this issue?

Thanks a lot for your time!