azure-sdk-for-net: [BUG] 502 (Bad gateway) when using CheckExistence() for Event Grid

Describe the bug Hi, I’m trying to use the following method to check existence of Azure Event Grid existence:

client.Resources.CheckExistence(Configuration.ResourceGroupName, "Microsoft.EventGrid", "", "topics", "test", "2020-06-01");

I managed to get a result few times, but most executions fails with Service request failed. error.

Expected behavior I should receive Response object with no error.

Actual behavior (include Exception or Stack Trace) In response I’m getting the following exception:

Service request failed.
Status: 502 (Bad Gateway)

Content:


Headers:
Cache-Control: no-cache
Pragma: no-cache
x-ms-failure-cause: REDACTED
x-ms-request-id: REDACTED
x-ms-correlation-request-id: REDACTED
x-ms-routing-request-id: REDACTED
Strict-Transport-Security: REDACTED
X-Content-Type-Options: REDACTED
Date: Tue, 09 Feb 2021 20:11:35 GMT
Connection: close
Content-Length: 151
Content-Type: application/json; charset=utf-8
Expires: -1

To Reproduce Steps to reproduce the behavior (include a code snippet, screenshot, or any additional information that might help us reproduce the issue)

I’m authenticating and creating the client as follows:

var credentials = new ClientSecretCredential(Configuration.TenantId, Configuration.ClientId, Configuration.ClientSecret);
var client = new ResourcesManagementClient(Configuration.SubscriptionId, credentials);

Then I’m performing a bunch of other operations(like checking if RG exists and perfoming deployment - those operations succeed):

var rgExists = client.ResourceGroups.CheckExistence(Configuration.ResourceGroupName);
client.Deployments.StartCreateOrUpdate((..)

But the command client.Resources.CheckExistence(Configuration.ResourceGroupName, "Microsoft.EventGrid", "", "topics", "test", "2020-06-01") fails.

Environment:

• Azure.ResourceManager.Resources 1.0.0-preview.2, Azure.Identity 1.3.0
• VS Code 1.53.0

.NET SDK (reflecting any global.json):
Version:   5.0.102
Commit:    71365b4d42

Runtime Environment:
OS Name:     Windows
OS Version:  10.0.18363
OS Platform: Windows
RID:         win10-x64
Base Path:   C:\Program Files\dotnet\sdk\5.0.102\

Host (useful for support):
 Version: 5.0.2
 Commit:  cb5f173b96

.NET SDKs installed:
 2.1.805 [C:\Program Files\dotnet\sdk]
 3.1.102 [C:\Program Files\dotnet\sdk]
 5.0.102 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
 Microsoft.AspNetCore.All 2.1.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
 Microsoft.AspNetCore.App 2.1.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.AspNetCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.AspNetCore.App 3.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.AspNetCore.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
 Microsoft.NETCore.App 2.1.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 3.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.NETCore.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
 Microsoft.WindowsDesktop.App 3.1.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
 Microsoft.WindowsDesktop.App 3.1.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
 Microsoft.WindowsDesktop.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]