Download file through WebApi returns JSON

I’m using Visual Studio 2019, WebApi project, .NET Core 3.1

My endpoint looks like this:

    [HttpGet("GetFile")]
    public async Task<HttpResponseMessage> GetFile([FromQuery] string filePath)
    {
        var bytes = await System.IO.File.ReadAllBytesAsync(filePath).ConfigureAwait(false);

        using var result = new HttpResponseMessage(HttpStatusCode.OK)
        {
            Content = new ByteArrayContent(bytes),
        };

        result.Content.Headers.ContentDisposition =
            new ContentDispositionHeaderValue("attachment")
            {
                FileName = Path.GetFileName(filePath),
            };

        result.Content.Headers.ContentType =
            new MediaTypeHeaderValue("application/octet-stream");

        return result;
    }

When I got to URL, it returns serialized HttpResponseMessage in JSON.
How can I download file from endpoint?

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

To simplify, you can just use something like:

public async Task<IActionResult> GetFile([FromQuery] string filePath)
{
   var bytes = await System.IO.File.ReadAllBytesAsync(filePath).ConfigureAwait(false);
   return File(bytes, "application/octet-stream", Path.GetFileName(filePath));
}

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0