Can't understand how to do server response with vibed

[Suliman via Digitalmars-d-learn]

On Saturday, 28 November 2015 at 18:46:05 UTC, Suliman wrote:
> And the second question. Why I am getting next error after 
> attempt to write to console JSON request:
>
> Error: cannot resolve type for res.writeJsonBody(T)(T data int 
> status = HTTPStatus.OK, string content_type = 
> "application/json; charset=UF-8", bool allow_chunked = false)
>
> void action(HTTPServerRequest req, HTTPServerResponse res)
> {
>     writeln(res.writeJsonBody);
> }

Eghm, sorry. Not req, but res, but again errr:

void action(HTTPServerRequest req, HTTPServerResponse res)
{
     writeln(req.writeJsonBody);
}

Error: no property 'writeJsonBody' for type 
'vibe.http.server.HTTPServerRequest'

But this method are present in docs:

http://vibed.org/api/vibe.http.client/HTTPClientRequest