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Fix WinHttpHandler when using authenticating proxies#30196
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davidsh merged 1 commit intodotnet:masterfrom Jun 8, 2018
davidsh:winhttp_proxy_auth
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Fix WinHttpHandler when using authenticating proxies#30196davidsh merged 1 commit intodotnet:masterfrom davidsh:winhttp_proxy_auth
davidsh merged 1 commit intodotnet:masterfrom
davidsh:winhttp_proxy_auth
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This was a regression from .NET Core 2.0 due to PR #28105. Proxy authentication using system default proxy settings that involve a PAC file (either autodiscovery or explicit PAC file) cause a NullReferenceException in WinHttpHandler in the CheckResponseForAuthentication() method. This problem is only discovered when using an authenticating proxy server (any auth scheme) that is discovered using PAC files. This is considered the "system default" proxy. When this occurs, the handler's Proxy property is null and dereferencing it caused the exception. Due to the problems described in #6997, the uri of the proxy can't be determined yet since it is only known to WinHTTP. Fixing #6997 is complicated and impacts performance. However, in most cases, as long as the credentials are a NetworkCredential object, knowing the uri of the proxy is needed. I tested this manually using the steps I described in #30191. I did not add any tests to this PR since they can't be run in CI. However, I am working on a task that will eventually add Enterprise-Scenario testing like this (PAC files, authenticating proxies, etc.) to our systems. Fixes #30191 Contributes to #6997
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@dotnet-bot test Outerloop Windows x64 Debug Build |
rmkerr
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Jun 7, 2018
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LGTM. Thanks for fixing this.
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@dotnet-bot test Outerloop Windows x64 Debug Build |
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Unrelated CI failure on Nano in System.Drawing.Common.Performance.Tests: |
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…0196) This was a regression from .NET Core 2.0 due to PR dotnet/corefx#28105. Proxy authentication using system default proxy settings that involve a PAC file (either autodiscovery or explicit PAC file) cause a NullReferenceException in WinHttpHandler in the CheckResponseForAuthentication() method. This problem is only discovered when using an authenticating proxy server (any auth scheme) that is discovered using PAC files. This is considered the "system default" proxy. When this occurs, the handler's Proxy property is null and dereferencing it caused the exception. Due to the problems described in dotnet/corefx#6997, the uri of the proxy can't be determined yet since it is only known to WinHTTP. Fixing dotnet/corefx#6997 is complicated and impacts performance. However, in most cases, as long as the credentials are a NetworkCredential object, knowing the uri of the proxy is needed. I tested this manually using the steps I described in dotnet/corefx#30191. I did not add any tests to this PR since they can't be run in CI. However, I am working on a task that will eventually add Enterprise-Scenario testing like this (PAC files, authenticating proxies, etc.) to our systems. Fixes dotnet/corefx#30191 Contributes to dotnet/corefx#6997 Commit migrated from dotnet/corefx@69c2e20
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This was a regression from .NET Core 2.0 due to PR #28105.
Proxy authentication using system default proxy settings that involve a PAC file
(either autodiscovery or explicit PAC file) cause a NullReferenceException in WinHttpHandler in the
CheckResponseForAuthentication() method.
This problem is only discovered when using an authenticating proxy server (any auth scheme) that is
discovered using PAC files. This is considered the "system default" proxy. When this occurs, the
handler's Proxy property is null and dereferencing it caused the exception.
Due to the problems described in #6997, the uri of the proxy can't be determined yet since it is only
known to WinHTTP. Fixing #6997 is complicated and impacts performance. However, in most cases, as
long as the credentials are a NetworkCredential object, knowing the uri of the proxy is not needed.
I tested this manually using the steps I described in #30191. I did not add any tests to this PR since
they can't be run in CI. However, I am working on a task that will eventually add Enterprise-Scenario
testing like this (PAC files, authenticating proxies, etc.) to our systems.
Fixes #30191
Contributes to #6997