title: What is clients1.google.com/ocsp?
body: <p>Website making request to clients1.google.com/ocsp with POST.
  Its making 2 requests in the same page. and both requests are identical.</p>
  
  <p>What its for? and why it make same 2 requests?</p>
  
  <p><strong>Request Header:-</strong> </p>
  
  <p>(Request-Line)  POST /ocsp HTTP/1.1</p>
  
  <p>Host    clients1.google.com</p>
  
  <p>User-Agent  Mozilla/5.0 (Windows NT 6.2; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0</p>
  
  <p>Accept  text/html,application/xhtml+xml,application/xml;q=0.9,<em>/</em>;q=0.8</p>
  
  <p>Accept-Language en-US,en;q=0.5</p>
  
  <p>Accept-Encoding gzip, deflate</p>
  
  <p>Content-Length  107</p>
  
  <p>Content-Type    application/ocsp-request</p>
  
  <p>Connection  keep-alive</p>
  
  <p><strong>Response Header :</strong></p>
  
  <p>(Status-Line)   HTTP/1.1 200 OK</p>
  
  <p>Content-Type    application/ocsp-response</p>
  
  <p>Date    Sat, 21 Sep 2013 14:08:40 GMT</p>
  
  <p>Expires Wed, 25 Sep 2013 14:08:40 GMT</p>
  
  <p>Cache-Control   public, max-age=345600</p>
  
  <p>Server  ocsp_responder</p>
  
  <p>Content-Length  463</p>
  
  <p>X-XSS-Protection    1; mode=block</p>
  
  <p>X-Frame-Options SAMEORIGIN</p>
  
  <p>Alternate-Protocol  80:quic</p>