HttpClient not sending post data to NancyFX endpoint - api

Question

I am doing some integration testing of my web API that uses NancyFX end points. I have the xUnit test create a test server for the integration test
private readonly TestServer _server;
private readonly HttpClient _client;
public EventsModule_Int_Tester()
{
//Server setup
_server = new TestServer(new WebHostBuilder()
.UseStartup<Startup>());
_server.AllowSynchronousIO = true;//Needs to be overriden in net core 3.1
_client = _server.CreateClient();
}
Inside a Test Method I tried the following
[Fact]
public async Task EventTest()
{
// Arrange
HttpResponseMessage expectedRespone = new HttpResponseMessage(System.Net.HttpStatusCode.OK);
var data = _server.Services.GetService(typeof(GenijalnoContext)) as GenijalnoContext;
//Get come random data from the DBcontext
Random r = new Random();
List<Resident> residents = data.Residents.ToList();
Resident random_residnet = residents[r.Next(residents.Count)];
List<Apartment> apartments = data.Apartments.ToList();
Apartment random_Apartment = apartments[r.Next(apartments.Count)];
EventModel model = new EventModel()
{
ResidentId = random_residnet.Id,
ApartmentNumber = random_Apartment.Id
};
//Doesnt work
IList<KeyValuePair<string, string>> nameValueCollection = new List<KeyValuePair<string, string>> {
{ new KeyValuePair<string, string>("ResidentId", model.ResidentId.ToString()) },
{ new KeyValuePair<string, string>("ApartmentNumber", model.ApartmentNumber.ToString())}
};
var result = await _client.PostAsync("/Events/ResidentEnter", new FormUrlEncodedContent(nameValueCollection));
//Also Doesnt work
string json = JsonConvert.SerializeObject(model, Formatting.Indented);
var httpContent = new StringContent(json, Encoding.UTF8, "application/json");
var response = await _client.PostAsync("/Events/ResidentEnter", httpContent);
//PostAsJsonAsync also doesnt work
// Assert
Assert.Equal(response.StatusCode, expectedRespone.StatusCode);
}
The NancyFX module does trigger the endpoint and receives the request but without the body
What am I doing wrong? Note that the NancyFX endpoint has no issue transforming a Postman call into a valid model.
The NancyFX endpoint

Answer 1

Alright I fixed it, for those curious the issue was that the NancyFX body reader sometimes does not properly start reading the request body. That is that the stream reading position isn't 0 (the start) all the time.
To fix this you need to create a CustomBoostrapper and then override the ApplicationStartup function so you can set up a before request pipeline that sets the body position at 0
Code below
protected override void ApplicationStartup(TinyIoCContainer container, IPipelines pipelines)
{
base.ApplicationStartup(container, pipelines);
pipelines.BeforeRequest.AddItemToStartOfPipeline(ctx =>
{
ctx.Request.Body.Position = 0;
return null;
});
}