im trying to implement a middleware for my azure functions type httprequest, im using the interface IFunctionsWorkerMiddleware on .net 6.

public class HistoryLogMiddleware : IFunctionsWorkerMiddleware
{
  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}");

    await next(context);

    var responseData =  context.GetHttpResponseData().Body;
    var resp = await new StreamReader(responseData).ReadToEndAsync();

    Console.WriteLine($"Response: {resp}");
  }
}

On my startup class:

[assembly: FunctionsStartup(typeof(Startup))]

public class Startup : FunctionsStartup
{
  public override void Configure(IFunctionsHostBuilder builder)
  {
    builder.Services.AddDatabases();
    builder.Services.AddExternals();
    builder.Services.AddUseCases();

    builder.Services.AddSingleton<HistoryLogMiddleware>();
  }
}

Testing the function, the domain class works fine (because the console shows…) but the middleware never register on console or attach on debug mode.

My function:

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

  [FunctionName(nameof(RegisterClientFunction))]
  public async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest req,
    ILogger log)
  {
    log.LogInformation("C# HTTP trigger function processed a request.");

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

    var resp = await ExecuterDomain.ExecuteAsync(() => _clientsDomain.RegisterClient(data));
    return new ObjectResult(resp);
  }
}

Does anybody know why the middleware isn’t being invoked ?