PL-400 Question #375: Real Exam Question with Answer & Explanation

Question

A company requires a plug-in that makes multiple requests to an external web service. The plug- in must not time out when the web service has issues or is slow to respond. You need to create the plug-in. What should you do?

Options

• AAssign the IOrganizationService object to a member variable.
• BRegister the plug-in to run synchronously.
• CRegister the plug-in step once for each web service request.
• DSet the HTTP connection KeepAlive property to false.

Explanation

To mitigate timeouts in a plug-in making multiple external web service requests, especially when the service is slow, setting the HTTP connection's KeepAlive property to false can help prevent issues with persistent connections.

Common mistakes.

• A. Assigning the IOrganizationService object to a member variable is an anti-pattern as IOrganizationService instances are not thread-safe and should be obtained per execution context; it does not affect external web service timeouts.
• B. Registering the plug-in synchronously means it runs within the transaction and is subject to the Dataverse plug-in execution timeout (typically 2 minutes), increasing the likelihood of a timeout if the external service is slow.
• C. Registering the plug-in step once for each web service request would not resolve a timeout issue for a single, long-running external call within one plug-in's execution.

Concept tested. Plug-in external service call timeouts

Reference. https://learn.microsoft.com/en-us/power-apps/developer/data-platform/best-practices/business-logic/use-web-services

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