Our web application uses XMPP for chat. We are using ejabberd xmpp server . We
have configured xmpp BOSH( http://xmpp.org/extensions/xep-0206.html ) via
HAProxy. But sometimes haproxy is throwing error with Status Code:504 Gateway
Time-out. Our application shows error as No 'Access-Control-Allow-Origin'
header is present on the requested resource. Origin '. But the same request
initially it works without any error. Can you please guide us on how to resolve