Exception de la fonction Azure (HttpTrigger) lors de la référence à une bibliothèque de classes standard .NET

Question

J'utilise WebJob SDK pour créer une fonction Azure dans Visual Studio 2017 (plus précisément un Slack WebHook sortant).

public static async Task<HttpResponseMessage> Run(
     [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)]HttpRequestMessage req, 
     TraceWriter log) 

Je peux déboguer la fonction localement et l'exécuter avec succès.

Puis j'ajoute une référence à une nouvelle bibliothèque nouvelle classe .NET, compiler et déboguer, et lors du déclenchement de la fonction, est présenté avec l'erreur suivante.

{ 
    "id": "2badc751-bd37-4482-90db-6dde1247110c", 
    "requestId": "60acb725-546e-4e62-9868-a5bd4c217bfc", 
    "statusCode": 500, 
    "errorCode": 0, 
    "message": "Exception while executing function: SlackWebHooks -> Exception binding parameter 'req' -> No MediaTypeFormatter is available to read an object of type 'HttpRequestMessage' from content with media type 'application/x-www-form-urlencoded'.", 
    "errorDetails": "Microsoft.Azure.WebJobs.Host.FunctionInvocationException : Exception while executing function: SlackWebHooks ---> System.InvalidOperationException : Exception binding parameter 'req' ---> System.Net.Http.UnsupportedMediaTypeException : No MediaTypeFormatter is available to read an object of type 'HttpRequestMessage' from content with media type 'application/x-www-form-urlencoded'.\r\n at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content,Type type,IEnumerable`1 formatters,IFormatterLogger formatterLogger,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Extensions.Http.HttpTriggerAttributeBindingProvider.HttpTriggerBinding.CreateUserTypeValueProvider(HttpRequestMessage request,String invokeString)\r\n at async Microsoft.Azure.WebJobs.Extensions.Http.HttpTriggerAttributeBindingProvider.HttpTriggerBinding.BindAsync(Object value,ValueBindingContext context)\r\n at async Microsoft.Azure.WebJobs.Host.Triggers.TriggeredFunctionBinding`1.BindCoreAsync[TTriggerValue](ValueBindingContext context,Object value,IDictionary`2 parameters) \r\n End of inner exception\r\n at Microsoft.Azure.WebJobs.Host.Executors.DelayedException.Throw()\r\n at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithWatchersAsync(IFunctionInstance instance,ParameterHelper parameterHelper,TraceWriter traceWriter,ILogger logger,CancellationTokenSource functionCancellationTokenSource)\r\n at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(??)\r\n at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(??) \r\n End of inner exception\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(??)\r\n at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsync(IFunctionInstance functionInstance,CancellationToken cancellationToken)\r\n at Microsoft.Azure.WebJobs.Host.Executors.ExceptionDispatchInfoDelayedException.Throw()\r\n at async Microsoft.Azure.WebJobs.JobHost.CallAsync(??)\r\n at async Microsoft.Azure.WebJobs.Script.ScriptHost.CallAsync(String method,Dictionary`2 arguments,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Script.WebHost.WebScriptHostManager.HandleRequestAsync(FunctionDescriptor function,HttpRequestMessage request,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Script.WebHost.Controllers.FunctionsController.ProcessRequestAsync(HttpRequestMessage request,FunctionDescriptor function,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Script.WebHost.Controllers.FunctionsController.<>c__DisplayClass3_0.<ExecuteAsync>b__0(??)\r\n at async Microsoft.Azure.WebJobs.Extensions.Http.HttpRequestManager.ProcessRequestAsync(HttpRequestMessage request,Func`3 processRequestHandler,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Script.WebHost.Controllers.FunctionsController.ExecuteAsync(HttpControllerContext controllerContext,CancellationToken cancellationToken)\r\n at async System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n at async System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Script.WebHost.Handlers.SystemTraceHandler.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n at async Microsoft.Azure.WebJobs.Script.WebHost.Handlers.WebScriptHostHandler.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n at async System.Web.Http.HttpServer.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)" 
} 

Je ne suis pas sûr de savoir pourquoi référencer la bibliothèque standard .NET changerait le comportement du SDK? Mais il est apparent qu'il est lié à MediaTypeFormatter, ou il manque de.