ASP.NET Core 3.1 get method body breaks the request

Issue happened on ASP.NET Core 3.1 Web API controller. I have a method in controller with [HttpGet] attribute and [FromBody] for only parameter:

public async Task<ActionResult> GetMessages([FromBody] MessageRM messagesRequest)

This method expects to receive a request model:
public class MessageRM
    public int RegionID { get; set; }
    public int? LastMessageID { get; set; }
    public int? StartMessageID { get; set; }
    public int? PageSize { get; set; }

When I do make a get request to this method without body the returning result is:
{"type":"","title":"Unsupported Media Type","status":415,"traceId":"|f6d2c92d-47865e9e3ad9a87d."}

That was quite unexpected. Had a feeling that I’m missing something important, this feeling increased when I passed the body. At first with ‘{}’, then fully simulating my request object. Either of these requests contained ‘application/json’ content-type header. Both times same response:
{"type":"","title":"One or more validation errors occurred.","status":400,"traceId":"|f6d2c92e-47865e9e3ad9a87d.","errors":{"$":["The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0."]}}

Any suggestions?


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Method 1

Change [HttpGet] for [HttpPost] and issue a POST request instead of a GET.

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