StatusCode: 400, ReasonPhrase: 'Bad Request' on web api call with object as parameter

-- -- 872

I have a web api method that accepts an object as parameter;

[HttpPost]  
public bool InsertApplicant(Applicants applicant)  
{  
  // ...  
}

I am consuming it using below code and I am getting 'StatusCode: 400, ReasonPhrase: 'Bad Request''.

using (var client = new HttpClient())  
{  
   client.BaseAddress = new Uri("http://example.com/api/InsertApplicant");  
  
   var postTask = client.PostAsJsonAsync<Applicants>("InsertApplicant", applicant);  
  
   postTask.Wait();  
  
   var result = postTask.Result;  
   // Getting StatusCode: 400, ReasonPhrase: 'Bad Request'  
}

What am I doing wrong?

Thanks

Regards

Viorel 112.1K Reputation points

2022-06-09T14:02:05.393+00:00

Check if this helps:

client.BaseAddress = new Uri("http://example.com/api");
Michael Taylor 48,281 Reputation points

2022-06-09T14:14:08.217+00:00
Bad request means the data you're sending isn't valid for the request being sent. Set a breakpoint on your InsertApplication call on the server and verify it is getting called correctly. You can then look at the data being sent to see what is wrong.

When setting BaseAddress ensure the URL ends with a /. If you don't then in some cases when you pass a relative URL as part of the client request then it won't combine the URLs correctly resulting in a bad address. It seems like your code should be something similar to this:

Note that you shouldn't be creating and disposing HttpClient instances for .NET Framework. You'll run into resource issues. You can google as to why. The correct
solution is to create the client once, set the base address and then reuse that instance. This is normally handled at app startup.

public class MyClient { public MyClient ( HttpClient client ) { _client = client; } public async Task InsertApplicant ( Applicants applicants ) { using (var response = await _client.PostAsJsonAsync("InsertApplicant", applicants).ConfigureAwait(false) { response.EnsureSuccessStatusCode(); //Do something with any response... }; } private readonly HttpClient _client; } //Somewhere in app startup or better yet through DI private readonly HttpClient _client = new HttpClient() { BaseAddress = new Uri("http://example.com/api/") };