Can't retrieve BadRequest errors when calling .NET CORE 5 Web API microservice from ASP.NET MVC project

Question

I am trying to retrieve ModelState validation errors from a micro service built with .NET Core 5 Web API from a ASP.NET Core MVC frontend.

Say I have a model that looks like this:

public class Comment
{
    public string Title { get; set; }
    [Required]
    public string Remarks { get; set; }
}

When I call the rest endpoint in the micro service through Swagger to update the Comment model without a remark, I get a response body like this:

{
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "Remarks": [
      "The Remarks field is required."
    ]
  }
}

Awesome! This is what I expect... However, when I call this endpoint through my MVC project, I can't seem to get the actual "errors".

This is how I am calling the rest endpoint:

var client = _httpClientFactory.CreateClient("test");
HttpContent httpContent = new StringContent(JsonConvert.SerializeObject(comment), Encoding.UTF8, "application/json"); 
HttpResponseMessage response = await client.PutAsync($"api/comments", httpContent);

The response object just has a statusCode of BadRequest. I want to pull the info regarding the errors (the section that says "The Remarks field is required.") but I don't see it in the Content or Headers property or anything like that.

I am new to micro services and .NET Core - am I doing something wrong? Do I need to add something to the startup.cs? Seems weird that I can get the BadRequest status but no supporting problem details.

Thanks in advance!

Answer 1

Be sure your web api controller is not declared with [ApiController].

Web Api Project:

//[ApiController]
[Route("api/[controller]")]
public class CommentsController : ControllerBase
{
    [HttpPut]
    public IActionResult Put([FromBody] Comment model)
    {
        if(ModelState.IsValid)
        {
            //do your stuff...
            return Ok();
        }
        return BadRequest(ModelState);
    }
}

Mvc Project:

HttpResponseMessage response = await client.PutAsync($"api/comments", httpContent);
var result = response.Content.ReadAsStringAsync().Result;