In addition to functions, the architecture of a software system defines numerous other properties, commonly referred to as non-functional or quality properties. In web applications, two well-known architectural styles are common. They are resource-oriented architectural style, implemented using RESTful principles, and message-passing architectural style, implemented in XMPP. These architectural styles have their different benefits, whereas in real applications properties of both are sometimes needed. In this paper we discuss how RESTful web architecture can be complemented with XMPP. As an example, we use a distributed content management system, which is built using RESTful design guidelines and complemented with message passing architectural style implemented on XMPP. Features of both architectural styles are used in a fashion where no negative feature interaction takes place. In the completed system, both architectural styles are clearly identifiable, and their non-functional properties are preserved.