RpcClient sometimes not working with latest Mono

I had been using an older Mono 3.2.8 with EdjCase.JsonRpc.Client and it was working well, however I just had to update to the latest Mono 4.4.2 because of incompatibilities with another library, and now the JsonRpc.Client is throwing an exception.

System.AggregateException: One or more errors occurred. ---> EdjCase.JsonRpc.Client.RpcClientUnknownException: Error occurred when trying to send rpc requests(s) ---> System.MissingFieldException: Field 'System.Net.HttpWebRequest.ResendContentFactory' not found.
  at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[TResult].Start[TStateMachine] (System.Runtime.CompilerServices.TStateMachine& stateMachine) <0x303a6c8 + 0x00117> in <filename unknown>:0 
  at System.Net.Http.HttpClientHandler.SendAsync (System.Net.Http.HttpRequestMessage request, CancellationToken cancellationToken) <0x303a538 + 0x0016b> in <filename unknown>:0 
  at System.Net.Http.HttpMessageInvoker.SendAsync (System.Net.Http.HttpRequestMessage request, CancellationToken cancellationToken) <0x303a3a0 + 0x00021> in <filename unknown>:0 
  at System.Net.Http.HttpClient.<SendAsync>__BaseCallProxy0 (System.Net.Http.HttpRequestMessage request, CancellationToken cancellationToken) <0x303a370 + 0x0001f> in <filename unknown>:0 
  at System.Net.Http.HttpClient+<SendAsyncWorker>c__async0.MoveNext () <0x3039350 + 0x00237> in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x18aa010 + 0x00035> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) <0x18a7830 + 0x000b7> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) <0x18a7790 + 0x00087> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) <0x18a7740 + 0x0003f> in <filename unknown>:0 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () <0x18a8040 + 0x00024> in <filename unknown>:0 
  at EdjCase.JsonRpc.Client.RpcClient+<SendAsync>c__async3`2[TRequest,TResponse].MoveNext () <0x2d8bb78 + 0x0042b> in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at EdjCase.JsonRpc.Client.RpcClient+<SendAsync>c__async3`2[TRequest,TResponse].MoveNext () <0x2d8bb78 + 0x008c7> in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x18aa010 + 0x00035> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) <0x18a7830 + 0x000b7> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) <0x18a7790 + 0x00087> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) <0x18a7740 + 0x0003f> in <filename unknown>:0 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () <0x18a8040 + 0x00024> in <filename unknown>:0 
  at EdjCase.JsonRpc.Client.RpcClient+<SendRequestAsync>c__async0.MoveNext () <0x2d8b640 + 0x0017f> in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x18aa010 + 0x00035> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) <0x18a7830 + 0x000b7> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) <0x18a7790 + 0x00087> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) <0x18a7740 + 0x0003f> in <filename unknown>:0 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () <0x18a8040 + 0x00024> in <filename unknown>:0 
  at Nethereum.JsonRpc.Client.RpcRequestResponseHandler`1+<SendRequestAsync>d__7[TResponse].MoveNext () <0x2d8ad30 + 0x001df> in <filename unknown>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () <0x18aa010 + 0x00035> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) <0x18a7830 + 0x000b7> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) <0x18a7790 + 0x00087> in <filename unknown>:0 
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) <0x18a7740 + 0x0003f> in <filename unknown>:0 
  at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[TResult].GetResult () <0x18a8040 + 0x00024> in <filename unknown>:0 
  at Nethereum.Web3.FunctionBase+<CallAsync>d__27`1[TReturn].MoveNext () <0x2d8a478 + 0x00213> in <filename unknown>:0

Edit: I tried using the netstarndard, net451, and portable dlls and it made no difference.

Just found this commit, the description says “Not support by Public HttpWebRequest, but HttpClient runs in this mode”

https://github.com/mono/mono/commit/ca2f879ce11ec034a17494316d64406c8a06a615

[jdluzen]

I also had this issue (though not using this project), removing Mono.Security.dll was the solution as well. This issue is literally the only result when searching for this error. Hopefully the Googlebot will pick it up.

[owlstack]

@kgalic Are you also having this issue with latest Xamarin or another thing? Thanks!