Posting to a Web API using HttpClient and Web API method [FromBody] parameter ends up being null
Have you tried inspecting the request in something like fiddler? It needs the content-type to be application/json as you have pointed out. But you are only setting the accept header.
Try:
StringContent content = new StringContent(JsonConvert.SerializeObject(product), Encoding.UTF8, "application/json");
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Blake Rivell
I am a .NET developer who builds custom web applications for businesses. I have a very strong passion for what I do. My hobbies are video games and fitness.
Updated on February 12, 2020Comments
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Blake Rivell about 4 years
I am attempting to POST to a Web API using the HttpClient. When I put a breakpoint in the Save method of the Web API the [FromBody] Product is null. This means that something is wrong with the way I am posting the product over to the Web API. Can someone please take a look at the below code and see where I might be going wrong. I am assuming it is something to do with headers and content types.
POST call from a client repository to the Web API which should pass the product object through as JSON:
public async Task<Product> SaveProduct(Product product) { using (var client = new HttpClient()) { client.BaseAddress = new Uri("http://localhost:99999/"); client.DefaultRequestHeaders.Accept.Clear(); client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); StringContent content = new StringContent(JsonConvert.SerializeObject(product)); // HTTP POST HttpResponseMessage response = await client.PostAsync("api/products/save", content); if (response.IsSuccessStatusCode) { string data = await response.Content.ReadAsStringAsync(); product = JsonConvert.DeserializeObject<Product>(data); } } return product; }
Web API Controller Method:
[HttpPost] [Route("save")] public IActionResult Save([FromBody]Product product) { if (customer == null) { return HttpBadRequest(); } _manager.SaveCustomer(product); return CreatedAtRoute("Get", new { controller = "Product", id = product.Id }, product); }
[FromBody] Product product parameter ends up being null.
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Xander about 6 yearsI would recommend NOT wrapping HttpClient in a using statement see aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong
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