Enable append custom data for “BadRequest”.

[Edward-Zhou]

For BadRequest in Asp.Net Core Web API 2.2, it will produce “ProblemDetails” response like:

Code:

[ApiController]
public class PostController : Controller {
  [HttpGet("posts")]
  public async Task<IActionResult> Get() {
    return BadRequest();
  }
}

Response:

{
  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
  "title": "Bad Request",
  "status": 400,
  "traceId": "0HLMFSL0C7SKB:00000001"
}

But, for BadRequest(new { errors = errors });, it will return errors without “ProblemDetails” like

Code:

[ApiController]
public class PostController : Controller {
  [HttpGet("posts")]
  public async Task<IActionResult> Get() {
    List<String> errors = new List<String> { "Code is invalid" };
    return BadRequest(new { errors = errors });
  }
}

Response:

{
  "errors": ["Code is invalid"]
}

I apply for it will return with ProblemDetails

{
  "errors": ["Code is invalid"],
  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
  "title": "Bad Request",
  "status": 400,
  "traceId": "0HLMFSL0C7SKB:00000001"
}

[mkArtakMSFT]

Thanks for contacting us, @Edward-Zhou.
We know about this and we plan to address this as part of #8537 issue.