ASP.net MVC clients consume patch API get Bad request 400 returns

Question

I'm using asp.net MVC 5 to consume API that also developed in asp.net MVC.

using (HttpClient httpClient1 = new HttpClient())
{
  string apiURLGetClientApproval = "/clients/approvals?action=" + actionType;
  HttpMethod method = new HttpMethod("PATCH");
  HttpRequestMessage message = new HttpRequestMessage(method, new Uri(baseAddress + apiURLGetClientApproval));
  StringContent content = new StringContent(json, Encoding.UTF8, "application/json");
  httpClient1.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("bearer", token.AccessToken);
  message.Content = content;
  var result = httpClient1.SendAsync(message).Result;
}

Answer 1

I have been dealing with the same exact problem for 2 days now. I just fixed it. I realised that sending a PATCH request probably required some specific payload [{"op":"replace"....}] as we can tell from using PostMan. However the PUT request doesn't, in fact most of the data on the business object would already be populated, so you modify what you want to change and send a PUT request instead. I just did that. I had to add the PUT action method in my controller and change the HttpClient to send a PUT request and it worked less than 5mins ago.

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