Which HTTP binding is used for duplex contracts?
WsDualHttpBinding
This is the WsDualHttpBinding. This binding is designed for use with Duplex Service contracts, which allows both the Services and clients to send and receive the messages.
What is duplex contract?
A duplex contract consists of two one-way contracts between the client and the server and does not require that the method calls be correlated. Use this kind of contract when your service must query the client for more information or explicitly raise events on the client.
What is a duplex message?
A duplex service contract is a message exchange pattern in which both endpoints can send messages to the other independently. A duplex service, therefore, can send messages back to the client endpoint, providing event-like behavior.
What are the available binding types?
Various Types of Bindings WCF Supports
- Basic binding. This binding is provided by the BasicHttpBinding class.
- Web binding. This binding is provided by the WebHttpBinding class.
- Web Service (WS) binding.
- TCP binding.
- IPC binding.
- MSMQ binding.
- Federated WS binding.
- Peer Network binding.
What is WCF service?
Windows Communication Foundation (WCF) is a framework for building service-oriented applications. Using WCF, you can send data as asynchronous messages from one service endpoint to another. A service endpoint can be part of a continuously available service hosted by IIS, or it can be a service hosted in an application.
What is WCF callback?
Abstract: In WCF, callback is used to implement PUSH mechanism, so that delayed or long running operation results can be automatically pushed back to the client application. WCF actively supports callback to its client, over the instance context established.
What is callback contract?
Callback contracts that have one-way operations represent calls from the service that the client can handle. The ServiceContractAttribute attribute is ignored on callback contracts. To configure runtime behavior of callback objects, use the System. ServiceModel. CallbackBehaviorAttribute.
Is the duplex exchange pattern meaning?
Duplex message exchange pattern is a way in WCF in which client and service both can send messages to each other independently. Duplex message exchange pattern also known as callback.
What is HTTP binding in WCF?
BasicHttpBinding is suitable for communicating with ASP.NET Web Service (ASMX) based services that conform to the WS-Basic Profile that conforms with Web Services. This binding uses HTTP as the transport and text/XML as the default message encoding. Security is disabled by default.
What is Net TCP binding?
The NetTcpBinding generates a run-time communication stack by default, which uses transport security, TCP for message delivery, and a binary message encoding. This binding is an appropriate Windows Communication Foundation (WCF) system-provided choice for communicating over an Intranet.
What is difference between WCF and Web API?
KEY DIFFERENCE WCF is used for developing SOAP-based services whereas Web API is used for both SOAP-based and RESTful services. WCF does not offer any support for MVC features whereas Web API supports MVC features. WCF supports HTTP, UDP, and custom transport protocol whereas Web API supports only HTTP protocol.
Is WCF a REST or SOAP?
Normally, a WCF service will use SOAP, but if you build a REST service, clients will be accessing your service with a different architectural style (calls, serialization like JSON, etc.). Exposing a WCF service with both SOAP and REST endpoints, requires just a few updates to the codebase and configuration.
Does the wsdualhttpbinding support duplex communication?
The WSDualHttpBinding binding supports duplex communication. The setup procedure and build instructions for this sample are located at the end of this topic. To configure a service endpoint with the WSDualHttpBinding, specify the binding in the endpoint configuration as shown.
What is the difference between a dual binding and a wsdualhttpbinding?
WSDualHttpBinding only supports SOAP security and requires reliable messaging. This binding requires that the client has a public URI that provides a callback endpoint for the service. This is provided by the ClientBaseAddress. A dual binding exposes the IP address of the client to the service.
What is a duplex service in Salesforce?
Duplex communication occurs when a client connects to a service and provides the service with a channel on which the service can send messages back to the client. Note that the event-like behavior of duplex services only works within a session. To create a duplex contract you create a pair of interfaces.
Why does a duplex contract require a session?
A duplex contract requires a session, because a context must be established to correlate the set of messages being sent between client and service. The WSDualHttpBinding binding supports duplex communication. The setup procedure and build instructions for this sample are located at the end of this topic.