Book Image

Practical XMPP

By : Steven Watkin, David Koelle
Book Image

Practical XMPP

By: Steven Watkin, David Koelle

Overview of this book

XMPP (eXtensible Messaging and Presence Protocol) is a messaging protocol that enables communication between two or more devices via the Internet. With this book, developers will learn about the fundamentals of XMPP, be able to work with the core functionality both server-side and in the browser, as well as starting to explore several of the protocol extensions. You will not only have a solid grasp of XMPP and how it works, but will also be able to use the protocol to build real-world applications that utilize the power of XMPP. By the end of this book, you will know more about networking applications in general, and have a good understanding of how to extend XMPP, as well as using it in sample applications.
Table of Contents (16 chapters)
Practical XMPP
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
1
An Introduction to XMPP and Installing Our First Server

C2S connection life cycle


To start exchanging stanzas between the client and server, an XMPP client must first form a connection with a server and start an XML stream. XMPP servers are generally found using a Domain Name System (DNS) Service record (SRV). If an SRV record does not exist, the client will attempt to connect to the resolved domain directly otherwise, a hostname can be supplied by the user themselves.

Once a connection has been formed, a stream will be started using the following message:

<?xml version="1.0"> 
<stream:stream xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0" to="brown.sci"> 

The server will then form its own return stream with the client in response:

<?xml version="1.0"> 
<stream:stream xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0" from="brown.sci" id="stream:1a3f"> 
    <stream:features> 
        <starttls xmlns="urn:ietf:params:xml...