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POProblem with WCF client calling one-way operation
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  1. POProblem with WCF client calling one-way operation
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    copied!<p>I have run into a problem when calling web service on a SAP PI bus from my WCF client. The operation is defined as one-way, and the method on my proxy operation contract is decorated accordingly when the service reference is added. However, the service client gets an exception when calling the according operation: </p> <p><strong><em>The one-way operation returned a non-null message with Action=''</em></strong></p> <p>Using SoapUI, the method on the bus can be called successfully, and it returns a SOAP envelope with an empty body. The bus people told me, this is according to the SOAP specs:</p> <hr> <p>(SOAP specs, chapter 4.7.9, One-way operations):</p> <p>There are differing interpretations of how HTTP is to be used when performing one-way operations. </p> <p><strong>R2714</strong> For one-way operations, an INSTANCE MUST NOT return a HTTP response that contains an envelope. Specifically, the HTTP response entity-body must be empty. </p> <p><strong>R2750</strong> A CONSUMER MUST ignore an envelope carried in a HTTP response message in a one-way operation. </p> <p><strong>R2727</strong> For one-way operations, a CONSUMER MUST NOT interpret a successful HTTP response status code (i.e., 2xx) to mean the message is valid or that the receiver would process it. </p> <hr> <p>So it seems, my WCF client doesn't comply with R2750.</p> <p>I have found out that when I force the operation contract on the proxy to be <em>IsOneWay = false</em>, everything works.</p> <p>Is there anything wrong with the way WCF handles one way operations or do I do something wrong (more likely)? Is there anything else I should do, it just doesn't seem right to override the generated WCF proxy client.</p> <p>Thanks for any suggestions.</p>
 

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