How to make the request body optional

Question

I've got the following POST function:

public async Task<BaseResponse> Post([FromBody] BodyParams content)
{
    var option = content.TopOnly;
    return await RunHttpMethodAsync(option, _worker.Lookup);
}

Here's the BodyParams class:

public class BodyParams
{
    public bool TopOnly { get; set; }
}

This works as intended. However, I'd like to make BodyParams content as optional, and set TopOnly to true if not provided. I've tried:

public class BodyParams
{
    public bool TopOnly { get; set; } = true;
}

And then not providing a body, but I get the following return:

{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.13",
    "title": "Unsupported Media Type",
    "status": 415,
    "traceId": "00-305034a9723b9a4f94e0601c6ecc3587-b67fe89deb8e644f-00"
}

I put a breakpoint on my var option, and I don't even reach that.

My question is, how can I make the request body optional for POSTs?

Answer 1

415 Unsupported Media Type - means that the request entity has a media type which the server or resource does not support.

If you use Postman, set this and try again

Also, to make it simpler, you can use

public async Task<BaseResponse> Post([FromBody] TopOnly? topOnly = true)