Error with PROFIND Requests

Have you ever seen an error trace like the below in the Sitecore log?

System.NotSupportedException: Unknown request type: PROPFIND
at Sitecore.Mvc.Helpers.WebHelper.GetRequestType (HttpContextBase httpContext)
at Sitecore.Mvc.Pipelines.Request.RequestBegin.ExecuteFormHandler.Process(RequestBeginArgs args)
...
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