Use one curl exec with multiple URLs instead of separate
curl calls, so that we make sure we use the same
connection to the web server ending up in the same
httpd child process.
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1908246 13f79535-47bb-0310-9956-ffa450edef68