Issues with PostJsonAsync using System.Text.Json

[CoolDaddyCool]

Hello there,
I have a simple class
public class Player
{
[JsonPropertyName("id")]
public int Id{ get; set; }

    [JsonPropertyName("name")]
    public int Name{ get; set; }

}
When I try to post as
string stringJson = JsonSerializer.Serialize(Player);' var content = new StringContent(stringJson, System.Text.Encoding.UTF8, "application/json"); var response = await httpClient.PostAsync(“myurl”, content);
it works fine.
But when I try to post as:
var response = await httpClient.PostAsJsonAsync(“myurl”, Player);
I get BadRequest.
I'm not the expert, but I think those 2 approaches should have the same result. Can anyone please try to explain why I get BadRequest with PostAsJsonAsync?

[davidfowl]

Where is the server code?

[campersau]

HttpClient.PostAsJsonAsync defaults to JsonSerializerDefaults.Web serializer options which are different from using JsonSerializer.Serialize directly.

See:
https://github.com/dotnet/runtime/blob/71c68bf465ffbb5abb3706405717325f34ca504f/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs#L142-L147

[CoolDaddyCool]

Thank you very much