Description of problem:
When I click Fedora from below page 
https://bugzilla.redhat.com/enter_bug.cgi?classification=Fedora
It just keeps on loading says 

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /enter_bug.cgi.

Reason: Error reading from remote server 



Version-Release number of selected component (if applicable):


How reproducible:
https://bugzilla.redhat.com/enter_bug.cgi?classification=Fedora


Steps to Reproduce:
1.GoTo https://bugzilla.redhat.com/enter_bug.cgi?classification=Fedora
2.Click Fedora 
3.
  
Actual results:
 The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /enter_bug.cgi.

Reason: Error reading from remote server

Expected results:
Fedora bugzilla page

Additional info: