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Mono missing winhttp.dll

See original GitHub issue

I’m using the latest mono version for Debian 8, and I just deployed Tweetinvi to the machine (ASP.NET app) but I am getting this error:

 Application Exception

 System.DllNotFoundException
 winhttp.dll
 
 Description: HTTP 500.Error processing request.
 Details: Non-web exception. Exception origin (name of application or object): Microsoft.Threading.Tasks.
 Exception stack trace:
   at (wrapper managed-to-native) Interop+WinHttp:WinHttpOpen (intptr,uint,string,string,int)
   at System.Net.Http.WinHttpHandler.EnsureSessionHandleExists (System.Net.Http.WinHttpRequestState state) [0x00089] in <c0e04d9c70cf48a6a179fbfd8ce69fd0>:0 
   at System.Net.Http.WinHttpHandler+<StartRequest>d__103.MoveNext () [0x00095] in <c0e04d9c70cf48a6a179fbfd8ce69fd0>:0 
 --- End of stack trace from previous location where exception was thrown ---
   at Microsoft.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00042] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
   at Microsoft.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess (System.Threading.Tasks.Task task) [0x0001c] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
   at Microsoft.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00009] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
   at Microsoft.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in <1c7d529d87ec4bdcbde02e9494f3b5ae>:0 
   at Tweetinvi.WebLogic.HttpClientWebHelper+<GetHttpResponse>d__0.MoveNext () [0x00104] in <89729572ccf046a586dfe214f5c4b961>:0 
 Version Information: 4.6.2 (Stable 4.6.2.16/ac9e222 Tue Jan 3 11:48:26 UTC 2017); ASP.NET Version: 4.0.30319.42000
 Powered by Mono

Mono JIT compiler version 4.6.2 (Stable 4.6.2.16/ac9e222 Tue Jan 3 11:48:26 UTC 2017) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: sgen

Running on Debian 8.7 .NET Framework 4.6.

Any clues? It appears to be linked to system.net. Thanks!