JSON "null" request body rejected as an empty request body
#40.415 aberto em 25 de fev. de 2022
Métricas do repositório
- Stars
- (37.933 stars)
- Métricas de merge de PR
- (Mesclagem média 16d 9h) (258 fundiu PRs em 30d)
Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
I have an action method which accepts a posted null value for the body:
[HttpPost("acceptsNull")]
public string Upload(WeatherForecast? forecast = null)
{
return JsonConvert.SerializeObject(forecast);
}
However, when I post a JSON null to this endpoint I get a 400 response complaining that the body is empty.
Expected Behavior
Since the body is not empty and JSON-deserializes to the model parameter type just fine, I expect it to invoke the action with a null model.
If it can't do that, I at least expect an error message that indicates nulls are not permitted rather than one claiming the body is empty (although if the body were actually empty instead of valid JSON I'd probably want this request to be rejected).
Steps To Reproduce
Call the above endpoint with:
using var client = new HttpClient();
using var response = client.PostAsJsonAsync(".../acceptsNull", default(WeatherForecast));
Console.WriteLine(response.StatusCode); // 400
Console.WriteLine(await response.Content.ReadAsStringAsync()); // ...A non-empty request body is required....
Exceptions (if any)
No response
.NET Version
6.0.100
Anything else?
The workaround I found is to set [FromBody(EmptyBodyBehavior = EmptyBodyBehavior.Allow)], but I don't really want to have to do this because I'd like to reject empty bodies and accept non-empty bodies which are JSON null.