Issue with PUT API Call Returning Null Body Status

Question

A developer is working with VS 2022 and C#.NET 9 to implement an API. When making a PUT request from Scalar, the breakpoint is hit and the update is processed, but an error message is received stating:

"failed to construct 'response' response with null body status cannot have body"

The API is designed to return NoContent(), but instead of receiving a 204 status code, the error message appears.

What steps can be taken to resolve this issue?

    [HttpPut("{id}")]
    public async Task<IActionResult> UpdateVidoeGame(int id, VideoGame updatedGame)

    {

        var game = await _context.VideoGames.FindAsync(id);

        if (game is null)

            return NotFound();

        game.Title = updatedGame.Title;

        game.Platform = updatedGame.Platform;

        game.Developer = updatedGame.Developer;

        game.Publisher = updatedGame.Publisher;

        await _context.SaveChangesAsync();

        return NoContent();

    }

Answer 1

this sounds like an issue with scalar. You probable have to add metadata to define the valid response codes. Probably defaults to 200. As scalar is an open source project, you will need to review its docs on how this is done.