get com.microsoft.azure.CloudException: Status code 405 calling genericResources.checkExistence() [QUERY]

**Query/Question**
https://github.com/Azure/azure-libraries-for-java/blob/master/azure-mgmt-resources/src/test/java/com/microsoft/azure/management/resources/GenericResourcesTests.java
Run test as above, after deleting resource
```
genericResources.deleteById(resource.id());
Assert.assertFalse(genericResources.checkExistence(newRgName, resource.resourceProviderNamespace(), resource.parentResourcePath(), resource.resourceType(), resource.name(), resource.apiVersion()));
```
checkExistence() sometimes triggers "CloudException 405".
The stack is as follows:
```
com.microsoft.azure.CloudException: Status code 405

at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
At java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at com.microsoft.azure.AzureResponseBuilder.buildEmpty(AzureResponseBuilder.java:72)
at com.microsoft.azure.management.resources.implementation.ResourcesInner.checkExistenceByIdDelegate( ResourcesInner.java:1912)
at com.microsoft.azure.management.resources.implementation.ResourcesInner.access$900(ResourcesInner.java:47)
at com.microsoft.azure.management.resources.implementation.ResourcesInner$63.call(ResourcesInner.java:1898)
at com.microsoft.azure.management.resources.implementation.ResourcesInner$63.call(ResourcesInner.java:1894)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
at retrofit2.adapter.rxjava.CallArbiter.deliverResponse(CallArbiter.java:120)
at retrofit2.adapter.rxjava.CallArbiter.emitResponse(CallArbiter.java:102)
at retrofit2.adapter.rxjava.CallExecuteOnSubscribe.call(CallExecuteOnSubscribe.java:46)
at retrofit2.adapter.rxjava.CallExecuteOnSubscribe.call(CallExecuteOnSubscribe.java:24)
at rx.Observable.unsafeSubscribe(Observable.java:10327)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:48)
at rx.internal.operators.OnSubscribeMap.call(OnSubscribeMap.java:33)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.subscribe(Observable.java:10423)
at rx.Observable.subscribe(Observable.java:10390)
at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:443)
at rx.observables.BlockingObservable.single(BlockingObservable.java:340)
at com.microsoft.azure.management.resources.implementation.ResourcesInner.checkExistenceById(ResourcesInner.java:1845)
at com.microsoft.azure.management.resources.implementation.GenericResourcesImpl.checkExistenceById(
GenericResourcesImpl.java:86)
```

Why did it happen and how to solve this problem?

**Setup (please complete the following information if applicable):**
- JRE Version: JDK 11
- SDK Version:
com.microsoft.azure azure-mgmt-graph-rbac 1.34.0

Inizia da azure-mgmt-resources/src/test/java/com/microsoft/azure/management/resources/GenericResourcesTests.java e riproduci la sequenza delete-then-checkExistence. Traccia la chiamata attraverso GenericResourcesImpl.java e ResourcesInner.java, usando lo stack frame segnalato di AzureResponseBuilder.java per analizzare il 405 intermittente. Il lavoro è completo quando il comportamento è spiegato e il test restituisce in modo affidabile false dopo l’eliminazione, senza una CloudException imprevista.

Scritto dal modello di indicizzazione a partire dal testo della issue.