ASP Core WebApi File Upload Allow All Content Types

Question

I'm trying to create a file upload endpoint, but it looks like the only requests that get through have to specify application/json as the content type. Here is what my endpoint looks like:

[HttpPost()]
public async Task<IActionResult> CreateFile([FromBody] IFormFile contents)

I'm running .NET Core 2.0, and my startup.cs is pretty much just stock. What am I doing wrong?

Answer 1

Your FromBody makes model binder think it should expect JSON formatted body. You either need to remove [FromBody] or put [FromForm] .

Answer 2

The [FromBody] attribute indicates that that request body should be JSON (or another formatter such as XML, if you've enabled it). If you're uploading a binary, you should either use [FromForm] or just don't use an attribute at all.