Webservice .NET core - connect second API

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C#

I want to create a Webservice. This webservice should call an other Endpoint from different services. That means, the Webservice should work like a Proxy.

I realize all GET Methods and one POST Method. But the last POST Method don't work. It is different to the first method.

In the first Method i get a file (datatype IFormFile) in the Body of the Post-Request as form-data. The response is the Status OK. That works.

In the second Method i get also such a file and some additional information (datatype string and int) in the Body of the Post-Request as form-data. But that doesn't work.

I have no error in the code itself. I have tried it out with Postman, load all the data as form-data in the body. I send the data and see in the logs the Post, but i need the response, which came back and there is no data. How should i do this.

That, what i posted, is the code right know. There you got a statuscode. But i don't need a statuscode. I need a responseBody. I have tried it with HttpContent and HttpResponseMessage. Both are empty.

What i do wrong?

What I have tried:

[HttpPost("Test")]
public StatusCodeResult trace(IFormFile file)
{
    try
    {
        if (file != null && file.Length > 0)
        {
            using (var client = new HttpClient())
            {
                try
                {
                    client.BaseAddress = new Uri("https://localhost:40111");

                    byte[] data;
                    using (var br = new BinaryReader(file.OpenReadStream()))
                        data = br.ReadBytes((int)file.OpenReadStream().Length);
                    ByteArrayContent bytes = new ByteArrayContent(data);

                    MultipartFormDataContent multiContent = new MultipartFormDataContent();

                    multiContent.Add(bytes, "image", file.FileName);
                    multiContent.Add(new StringContent("132"), "itemId");
                    var result = client.PostAsync("/test", multiContent).Result;
                    HttpContent response = result.Content;
                    return StatusCode((int)result.StatusCode); //201 Created the request has been fulfilled, resulting in the creation of a new resource.

                }
                catch (Exception)
                {
                    return StatusCode(500); // 500 is generic server error
                }
            }
        }
        return StatusCode(400); // 400 is bad request
    }
    catch (Exception)
    {
        return StatusCode(500); // 500 is generic server error
    }
}