The application completed without reading the entire request body, .net core 2.1.1

It happened to me in a new ASP.NET Core 2.1 service when debugging in localhost because I had in Startup.Configure:

app.UseHttpsRedirection();

I deactivated this setting when debugging locally:

if (env.IsDevelopment())
{
     app.UseDeveloperExceptionPage();
}
else
{
     app.UseHttpsRedirection();
}

The error info of the application completed without reading the entire request body often occurs when the client send a request that doesn't fulfill the sever requirements . In other words , it happens just before entering the action , resulting that you cannot debug it via a breakpoint within the body of action method .

For example , let's say a action method on the server :

[Route("api/[controller]")]
[ApiController]
public class DummyController : ControllerBase
{
    [HttpPost]
    public DummyDto PostTest([FromBody] DummyDto dto)
    {
        return dto;
    }
}

The DummyDto here is a dummy class to hold information:

public class DummyDto 
{
    public int Id { get; set; }
}

When clients send a request with payload not well formatted

For example , the following post request , which doesn't have a Content-Type: application/json header :

POST https://localhost:44306/api/test HTTP/1.1
Accept : application/json

{ "id":5 }

will result in a similar error info :

Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request starting HTTP/1.1 POST http://localhost:44306/api/test  10
Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request finished in 1.9319ms 404 
Microsoft.AspNetCore.Server.Kestrel:Information: Connection id "0HLGH8R93RPUO", Request id "0HLGH8R93RPUO:00000002": the application completed without reading the entire request body.

and the response from the server will be 404:

HTTP/1.1 404 Not Found
Server: Kestrel
X-SourceFiles: =?UTF-8?B?RDpccmVwb3J0XDIwMThcOVw5LTFcU08uQXV0aFJlYWRpbmdXaXRob3V0RW50aXRlQm9keVxBcHBcQXBwXGFwaVx0ZXN0?=
X-Powered-By: ASP.NET
Date: Mon, 03 Sep 2018 02:42:53 GMT
Content-Length: 0

As for the question you described , I suggest you should check the following list :

1. does the Postman send the request with a header of Content-Type: application/json ? make sure you have checked the header
2. If step1 doesn't work , click the code to show what it sends exactly when you send a request to the server .

There can be multiple reasons out of which one can be : – Caching in Visual Studio --

1.Close all the instances of visual studios, run Developer command prompt with Admin rights.
2.git clean -xfd [Your Repository to remove all dependencies and existing soln file]
3.take the latest build and run . [Make Endpoint AllowAnonymous]