Test failure: System.Net.Http.Functional.Tests.HttpClientHandler_DefaultProxyCredentials_Test / ProxyExplicitlyProvided_DefaultCredentials_Ignored

[karelz]

Types of failures

The operation has been canceled

Failure 20171215.05:

System.Net.Http.HttpRequestException : An error occurred while sending the request.
---- System.Net.Http.WinHttpException : The operation has been canceled
   at System.Net.Http.HttpClient.<FinishSendAsyncBuffered>d__58.MoveNext() in E:\A\_work\1955\s\corefx\src\System.Net.Http\src\System\Net\Http\HttpClient.cs:line 464
--- End of stack trace from previous location where exception was thrown ---
   at System.Net.Http.Functional.Tests.LoopbackGetRequestHttpProxy.<StartAsync>d__2.MoveNext() in E:\A\_work\1955\s\corefx\src\System.Net.Http\tests\FunctionalTests\LoopbackGetRequestHttpProxy.cs:line 100
--- End of stack trace from previous location where exception was thrown ---
   at System.Net.Http.Functional.Tests.HttpClientHandler_DefaultProxyCredentials_Test.<ProxyExplicitlyProvided_DefaultCredentials_Ignored>d__2.MoveNext() in E:\A\_work\1955\s\corefx\src\System.Net.Http\tests\FunctionalTests\HttpClientHandlerTest.DefaultProxyCredentials.cs:line 69
--- End of stack trace from previous location where exception was thrown ---
--- End of stack trace from previous location where exception was thrown ---
--- End of stack trace from previous location where exception was thrown ---
----- Inner Stack Trace -----
   at System.Threading.Tasks.RendezvousAwaitable`1.GetResult() in E:\A\_work\1955\s\corefx\src\Common\src\System\Threading\Tasks\RendezvousAwaitable.cs:line 62
   at System.Net.Http.WinHttpHandler.<StartRequest>d__105.MoveNext() in E:\A\_work\1955\s\corefx\src\System.Net.Http.WinHttpHandler\src\System\Net\Http\WinHttpHandler.cs:line 858

History of failures

Previously, the test was failing (on .NET Core) on different error: https://github.com/dotnet/corefx/issues/23702#issuecomment-352601673

Day	Build	OS	Error message
12/15	20171215.05	Win8.1	The operation has been canceled - link
12/16	20171216.01	Win8.1	The operation has been canceled - link (ManagedHandler)
2/9	20180209.05	Win8.1	The operation has been canceled - link

One of the failures is on MangedHandler - most likely a test issue.

[rmkerr]

I took a look at a wireshark capture of this failure, and it looks to me like the correct request is being sent to the LoopbackGetRequestHttpProxy. The request includes the correct credentials (rightusername:rightpassword), but no response is ever received. That leads me to think that the issue might be another server problem, since the LoopbackGetRequestHttpProxy ultimately makes a request to the corefx-net.cloudapp.net echo server.

[karelz]

Why do you think LoopbackGetRequestHttpProxy forwards to echo server?
Based on the name and brief code inspection, it should be just local on loopback. Is it not the case?

Test source code for future reference:
https://github.com/dotnet/corefx/blob/7bdd866d7711c2d766772ab50b5c8367f227a2eb/src/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.DefaultProxyCredentials.cs#L49

[karelz]

Or did you mean the test itself uses echo servers?

https://github.com/dotnet/corefx/blob/7bdd866d7711c2d766772ab50b5c8367f227a2eb/src/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.DefaultProxyCredentials.cs#L64

[rmkerr]

That's what I assumed was happening after looking at the code, particularly lines 96-100 of the LoopbackGetRequestHttpProxy:

// Forward the request to the server.
var request = new HttpRequestMessage(HttpMethod.Get, url);
foreach (var header in headers) request.Headers.Add(header.Key, header.Value);
using (HttpClient outboundClient = new HttpClient())
using (HttpResponseMessage response = await outboundClient.SendAsync(request).ConfigureAwait(false))

But yes, that would be specific to this particular test since it takes the remote url from the request.