DirectLine: Duplicated execution per request when running in multiple web app instances with Session affinity off

[dawwa]

Github issues should be used for bugs and feature requests. Use Stack Overflow for general "how-to" questions.

Version

microsoft.bot.connector.directline\3.0.2\lib\netstandard1.3\Microsoft.Bot.Connector.DirectLine.dll

Describe the bug

Duplicated dialog launching happens when deploying in the Azure Web App Service with multiple instances and Session affinity off.
Turning the Session affinity on fixed the problem.

To Reproduce

Steps to reproduce the behavior:

1. Deploy the directline sample into a web app service
2. Scale the service plan to 4 instances
3. Make sure the web app service Session affinity is at off state.
4. Issue Directline http request and check the dialog execution

Expected behavior

Only one execution per request.

Actual behavior

Multiple execution observed.

[bug]