Hi i’m implementing a middleware in project azure function (Isolated), i need get the value from request body and show it in console (from middleware class), but i ever get empty value “”, and another problem its the functionality in the next(context) method apparently its not called and never ends.

The middleware:

 public class HistoryLogMiddleware : IFunctionsWorkerMiddleware
 {
   public HistoryLogMiddleware() { }

   public async Task Invoke(FunctionContext context, FunctionExecutionDelegate next)
   {
     var requestData = await context.GetHttpRequestDataAsync();
     var body = await new StreamReader(requestData.Body).ReadToEndAsync();

     Console.WriteLine($"Request Body: {body}");

     requestData.Body.Position = 0;
     await next(context); //when arrivals here does nothing...     
  }
}

The function:

 public class RegisterClientFunction
 {
   private readonly IClientsDomain _clientsDomain;
   public RegisterClientFunction(IClientsDomain clientsDomain)
   {
     _clientsDomain = clientsDomain;
   }

   [Function(nameof(RegisterClientFunction))]
   public async Task<HttpResponseData> RunAsync(
     [HttpTrigger(AuthorizationLevel.Function, "post")] HttpRequestData req)
   {
     //log.LogInformation("C# HTTP trigger function processed a request.");

     string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
     var data = JsonConvert.DeserializeObject<RegisterClientRequest>(requestBody);

     var respDomain = await ExecuterDomain.ExecuteAsync(() => _clientsDomain.RegisterClient(data));

     var response = req.CreateResponse((HttpStatusCode)respDomain.Status);
     response.Headers.Add("Content-Type", "text/plain; charset=utf-8");
     await response.WriteStringAsync(JsonConvert.SerializeObject(respDomain).ToString(), Encoding.UTF8);

     return response;
   }
 }

The Program.cs :

var host = new HostBuilder()
.ConfigureFunctionsWebApplication()
.ConfigureFunctionsWorkerDefaults(worker => worker.UseMiddleware<HistoryLogMiddleware>())
.ConfigureServices(services => {
    services.AddApplicationInsightsTelemetryWorkerService();
    services.ConfigureFunctionsApplicationInsights();
    services.AddDatabases();
    services.AddExternals();
    services.AddUseCases();
})
.Build();

await host.RunAsync();

Result with middleware:

Result without miiddleware (i comment .ConfigureFunctionsWorkerDefaults(worker => worker.UseMiddleware())):

ignore the result 500, its normal in my example.

Does anybody know why it occurs when i use the middleware?