Integration Server 10.11 | Web Services Developer’s Guide | SOAP Message Exchange Patterns | How Integration Server Determines the MEP Type to Use
 
How Integration Server Determines the MEP Type to Use
 
WSDL for Service First Providers
WSDL for WSDL First Providers and Consumers
Typically, the MEP type that an operation uses depends on whether its WSDL includes <wsdl:output> and/or <wsdl:fault> elements. A <wsdl:output> element defines the output a provider returns or that a consumer expects. A <wsdl:fault> element indicates whether a provider should respond with a fault or a consumer should expect a fault if an exception occurs. The table below summarizes the MEP type based on the WSDL for an operation.
<wsdl:output> element?
<wsdl:fault> element?
MEP Type
Yes
Yes or No
In-Out MEP
No
No
In-Only MEP
No
Yes
Robust In-Only MEP
For Integration Server MEP support, a web service descriptor’s Pre-8.2 compatibility mode property can alter the MEP type defined by the WSDL.
*For provider web service descriptors, when the Pre-8.2 compatibility mode property is false, Integration Server uses the MEP type based on the WSDL, as described in the table above. However, when the Pre-8.2 compatibility mode property is true, Integration Server always uses In-Out MEP.
*For consumer web service descriptors, the web service connector always expects responses based on the WSDL. For example, if the WSDL includes a <wsdl:output> element, it expects a SOAP response. If the provider appropriately provides a response/fault based on the WSDL for the operation, the Pre-8.2 compatibility mode property does not affect the behavior.
However, the Pre-8.2 compatibility mode property does dictate how a web service connector reacts to receiving unexpected SOAP responses. When the Pre-8.2 compatibility mode property is false, Integration Server ignores unexpected responses. When the Pre-8.2 compatibility mode property is true, Integration Server honors unexpected responses. For more information, see How <wsdl:output> and <wsdl:fault> Elements Affect a Consumer.
Note:
For consumers, Integration Server provides partial support for Robust In-Only for SOAP over JMS. For more information, see Consumer Support for Robust In-Only Operations with SOAP/JMS Bindings.