Asp.Net Core Form Post Results in a Http 415 Unsupported Media Type Response

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

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.

415 Unsupported Media Type in ASP.NET core web api

Which version of .NET Core are you using?

Try doing the request from the browser and see if you have the same result.

Also, are you sure you're doing a GET and not a POST request in Postman? You shouldn't get 415 errors for GET requests, especially when you're not sending any body.
This error mainly occurs when you try to send a body and you haven't specified the media-type through the Content-Type header.

Ensure that the request is GET and your body is empty.

Solution after post edit:

As you're trying to parse a DTO object(SomeClassObj), you should specify where the values should come from. In order to fix your specific case, add the [FromQuery] attribute before SomeClassObj.

Your code should look like this:

[ApiController]
[Route("MyController")]
public class MyController : ControllerBase
{
    [HttpGet]
    [Route("GetResult")]
    public IActionResult GetResult(string param1, string param2= null, [FromQuery]SomeClassObj obj = null)
    {  .... }
}

This tells the parser to fetch the data from the query string. This will fix the 415 issue. However, if you want to bind to complex types, especially on get, checkout those topics: ASP.NET CORE 3.1 Model Binding and this issue as you will most probably encounter issues with parsing your DTO object.

415 Unsupported Media Type asp.net core

Try using [FromForm] instead of [FromBody] for the method parameter if you're POSTing form data.

"Unsupported Media Type", 415 eror when post request in react-native

The problem is in the parameters of fetch. fetch doesn't have any parameter named header but it's headers with an s. So, your code wasn't asking for the correct Content-type and Accept Headers. To fix this just add an s to the header key :

fetch('http:/.../api/login/register/',{
        method:'post',
        headers:{
            'Accept': 'application/json',
            // 'Content-type': 'application/json'
    'Content-Type': 'application/json; charset=utf-8'
        },
        body:JSON.stringify({               
            'kullaniciAdi': userName,
            'sifre': userPassword
        })          
    })    
    .then((response) => response.json())
     .then((responseJson)=>{
   console.log(Object.values(responseJson));

Unfortunately, Javascript doesn't highlight this error.

Error 415 while uploading a file through Postman to ASP.NET Core API

If you want to receive IFormFile, you need post content-type=multiple/form-data which is from form data instead of body. Also remember to change [FromBody] to [FromForm].

Postman:

Controller:

[HttpPost]
[Route("{id}")]
public async Task<IActionResult> PostImage([FromForm] IFormFile file, [FromRoute] int id)

{}

If you post file from body, maybe you post a byte array. If though you need change IFormFile file to byte[] file.

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