.net core 2.1 “POST” an IFormFile using Postman -

Question

I'm working on a dotnet core WebAPI 2.1 and I can't find a way of sending to into the Body an image.

The controller looks like this:

    [HttpPost("api/image")]
    public IActionResult Post([FromBody]IFormFile file)
    {
        var filePath = Path.GetTempFileName();
        if (file.Length > 0)
        {
            return Ok();
        }
        return BadRequest();
    }

And this is my Postman call:

This call is never finishing as the Kestrel is failing

I've already tried to use Consumes

[Consumes("application/json", "application/json-patch+json", "multipart/from-data")]

Also in postman, I have set Content-Type to multipart/form-data

Answer 1

I know this has been answered, but you seem to having decided for an workaround. There is nothing wrong with your endpoint nor with the Postman request, I had the same issue and installing the native Postman for my OS solved the problem https://www.getpostman.com/apps

Answer 2

Try doing it like this. Use the same request in postman you are using now. This is just crude boilerplate method but you get the idea.

Also, dont forget to set headers of your request in postman to: Content-Type: multipart/form-data

[HttpPost]
[Route("api/image")]
public async Task<IHttpActionResult> InsertNewMerchant()
{
        // your form data is here
             var formData = HttpContext.Current.Request.Form;
             HttpFileCollection files = HttpContext.Current.Request.Files;


            if (files.Count == 1)
            {
            // this is the file you need 
                var image = files[0];
                    // do something with the file
            }
    return StatusCode(System.Net.HttpStatusCode.Created);
}

Answer 3

I tried and it worked. Maybe you forget to do something. Remove [FromBody] attribute.

    [HttpPost("api/image")]
    public IActionResult Post(IFormFile file)
    {
        var filePath = Path.GetTempFileName();
        if (file.Length > 0)
        {
            return Ok();
        }
        return BadRequest();
    }

Postman automatically attaches the correct Content-Type, select form-data option in body section and add your file with file key.

It should work.

Answer 4

Seems like there is an error problem with Postman macOS application. When I'm using the postman chrome extension everything works as expected.

MacOS app

Chrome extension