Basic Concepts

Connection Architecture

There are three possible ways to bind XMPP to a transport:

  1. TCP binding
  2. HTTP binding (BOSH: XEP-0124)
  3. WebSocket binding (RFC 7395)

Each transport binding

  1. has its own configuration, e.g. BOSH connections could use a key sequence, while TCP connections could use a white space interval.
  2. can use different transport implementations, e.g. a BOSH connection can be established with different HTTP implementations like or

A transport connector establishes a connection using one of the three transport bindings with a specific implementation, i.e. it is a factory for a connection.

A Connection is used by a Session to send and receive XMPP elements.

The following diagram shows the involved classes:

Connection Architecture