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One possible cause of the "HTTP/1.1 500 Internal Server Error" error when doing load testing on an Azure web app is that the web app is not configured to handle the load. This error can be resolved by scaling the web app to handle the increased load. To scale the web app, you can configure the number of instances, autoscaling settings, or the number of cores and memory. Additionally, you can also set up a traffic manager to evenly distribute the load across multiple web apps or regions. You can find more information on how to scale an Azure web app in the Azure documentation.
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