ASP.NET Core form POST results in a HTTP 415 Unsupported Media Type response

Question

Sending a form POST HTTP request (Content-Type: application/x-www-form-urlencoded) to the below controller results into a HTTP 415 Unsupported Media Type response.

public class MyController : Controller {     [HttpPost]     public async Task<IActionResult> Submit([FromBody] MyModel model)     {         //...     } } 

Form post HTTP headers:

POST /submit HTTP/1.1 Host: example.com:1337 Connection: keep-alive Content-Length: 219 Pragma: no-cache Cache-Control: no-cache Origin: https://example.com:1337 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Content-Type: application/x-www-form-urlencoded Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Referer: https://example.com:1337/submit Accept-Encoding: gzip, deflate, br Accept-Language: en-US,en;q=0.8,nl;q=0.6 

This used to work with ASP.NET MVC 5 on .NET 4.6.

Answer 1

For forms, use the [FromForm] attribute instead of the [FromBody] attribute.

The below controller works with ASP.NET Core 1.1:

public class MyController : Controller {     [HttpPost]     public async Task<IActionResult> Submit([FromForm] MyModel model)     {         //...     } } 

Note: [FromXxx] is required if your controller is annotated with [ApiController]. For normal view controllers it can be omitted.