title: httpurlconnection thread safety
body: <p>Is HttpUrlConnection thread safe? I.e. if I have an HttpConnection instance connected to a server and this instance is used by different threads (e.g.try  to send a POST concurrently) how will this situation be handled by HttpUrlConnection? a) Will they send the POSTs serially, or b) the first thread sends the POST, gets the response and then the second thread will send the POST? If they send the POSTs serially, this means multiple active POSTs to the same tcp connection. Is this allowed? Can it be handled by a server?</p>
  
  <p>Thanks</p>