Kudu on Azure Webapp calls "Invalid URI: hostname could not be parsed." an exception

Question

Since yesterday (2016-02-11 18:32 EST) we get this mysterious error in the monitoring logs of Azure Webapps "New Relic". It seems to happen every 5 minutes. We have five applications, all of which were deployed around this exact time yesterday, but the deployment process will be the same as before ...

Applications are all functional. I don’t know where this error came from, but it is mentioned in the stack traceKudu.Services.Web.Tracing.TraceModule.OnBeginRequest

Error message
System.UriFormatException: Invalid URI: The hostname could not be parsed.

Stack trace
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
at System.Web.Util.UriUtil.BuildUriImpl(String scheme, String serverName, String port, String path, String queryString, Boolean useLegacyRequestUrlGeneration)
at System.Web.Util.UriUtil.BuildUri(String scheme, String serverName, String port, String path, String queryString)
at System.Web.HttpRequest.BuildUrl(Func`1 pathAccessor)
at System.Web.HttpRequest.get_Url()
at Kudu.Services.Web.Tracing.TraceModule.TryConvertSpecialHeadersToEnvironmentVariable(HttpRequestWrapper request)
at Kudu.Services.Web.Tracing.TraceModule.OnBeginRequest(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Any ideas what causes this? Is this a Kudu / Azure question? Can I do anything?

Answer 1

Kudu, (build 51.50211.2078). , ​​ (build 51.50212.2079) . .

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