Simple string returned by controller action is not a valid JSON!

``` csharp
[HttpGet]
public string Get()
{
    return "Hello World!";
}
```

ASP.NET MVC Core 1.0.0 does this:

```
200 OK

Transfer-Encoding: chunked
Content-Type: application/json; charset=utf-8
Server: Kestrel
X-SourceFiles: =?UTF-8?B?RDpcVlNcQWNjZWxpc3QuQUlTXEFjY2VsaXN0LkFJUy5XZWJBcHBcYXBpXHZhbHVlcw==?=
X-Powered-By: ASP.NET
Date: Fri, 01 Jul 2016 10:18:31 GMT

Hello World!
```

Meanwhile in ASP.NET Web API 5.2.3 does this:

```
200 OK

Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/json; charset=utf-8
Expires: -1
Server: Microsoft-IIS/10.0
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?RDpcVlNcQWNjZWxpc3QuTURNXEFjY2VsaXN0Lk1ETS5TZXJ2ZXJcYXBpXHRlc3Q=?=
X-Powered-By: ASP.NET
Date: Fri, 01 Jul 2016 10:22:10 GMT
Content-Length: 13

"Hello World"
```

ASP.NET MVC 5.2.3, when returning`Json("Hello World", JsonRequestBehavior.AllowGet)`, does this:

```
200 OK

Cache-Control: private
Content-Type: application/json; charset=utf-8
Server: Microsoft-IIS/10.0
X-AspNetMvc-Version: 5.2
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?RDpcVlNcQWNjZWxpc3QuTURNXEFjY2VsaXN0Lk1ETS5TZXJ2ZXJcaGVsbG8=?=
X-Powered-By: ASP.NET
Date: Fri, 01 Jul 2016 10:23:57 GMT
Content-Length: 13

"Hello World"
```

This is an unexpected behavior for me. Is this a bug or feature? I believe `"Hello World!"` is a valid JSON response, not `Hello World!`. Javascript `JSON.parse()` function can parse the former but not the latter.


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Simple string returned by controller action is not a valid JSON! #4945

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Simple string returned by controller action is not a valid JSON! #4945

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