title: Google Server gives a server error with the first request in private browsing mode
body: <p>Whenever I run the url <code>https://scholar.google.com/citations?user=N7m4vIQAAAAJ&amp;hl=en</code> in private windows of Safari and Google Chrome, Google gives an errors.</p>
  
  <p>It happens only on the first request with private browsing mode. </p>
  
  <p>Anybody knows why this happens only in specific environment?
  This has been happening since 3 days ago.</p>
  
  <p>-- an error message and a capture</p>
  
  <p><code>Server Error
  We're sorry but it appears that there has been an internal server error while processing your request. Our engineers have been notified and are working to resolve the issue.
  Please try again later.</code></p>
  
  <p><a href="https://i.stack.imgur.com/1pM9P.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1pM9P.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/22NmD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/22NmD.png" alt="enter image description here"></a></p>
  
  <p>--- added</p>
  
  <p>The header file includes</p>
  
  <p><code>http header response
  Cache-Control: no-cache, must-revalidate
  Content-Encoding: gzip
  Content-Type: text/html; charset=UTF-8
  Date: Mon, 16 Nov 2015 19:35:39 GMT
  Expires: Fri, 01 Jan 1990 00:00:00 GMT
  Pragma: no-cache
  Server: citations
  Set-Cookie: NID=73=eF98qod1NpYg7nb03RUToiSiacFgqNoZxQ4CuzqwGlQn53SoR7rHlzO0OExsmYkpRazROCQ3WqKoCsWKFPxp8dZr5pBra6nD1HPcxWUILl9gVAf5Q7GSQc3B0O3TP4gu; expires=Tue, 17-May-2016 19:35:39 GMT; path=/; domain=.google.com; HttpOnly
  X-Firefox-Spdy: h2
  X-Frame-Options: SAMEORIGIN
  X-XSS-Protection: 1; mode=block
  p3p: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&amp;answer=151657 for more info."
  x-content-type-options: no sniff</code></p>