Error reading JObject from JsonReader. Path ”, line 0, position 0.”

I am using the following code to call a post interface in Visual Studio 2022:

Error reading JObject from JsonReader. Path ”, line 0, position 0.”

I am using the following code to call a post interface in Visual Studio 2022:

httpclient BaseAddress localhost Refers to webserver localhost or client localhost?

httpclient.BaseAddress = new Uri(“http://localhost:64195/”);