11.1. Introduction to WS-MakeConnection

The WS-MakeConnection specification defines a protocol that allows messages to be transferred between WS-MakeConnection-aware nodes by using a transport-specific back-channel. The protocol itself is described in a transport-independent manner. This allows it to be implemented using different network technologies. To support interoperable Web services, a SOAP binding is defined within WS-MakeConnection specification.

The WS-MakeConnection mechanism for the transfer of messages between two endpoints is useful in situations when the sending endpoint is unable to initiate a new connection to the receiving endpoint. Such situation may typically occur when a connection from a non-adressable client is broken before a response to client's request has been delivered. Rather than discarding the old response, replaying the whole request/response message exchange and generating a new response, which may be computationally or otherwise resource intensive, WS-MakeConnection provides a way how to uniquely identify non-addressable endpoints, and a mechanism by which undelivered messages destined for those endpoints can be delivered.

As all of the WS-* technologies, WS-MakeConnection mechanism is extensible allowing additional functionality, such as security, to be tightly integrated. WS-MakeConnection specification integrates with and complements the WS-ReliableMessaging, WS-Security, WS-Policy, and other Web services specifications.

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