Can't understand how to do server response with vibed

[Suliman via Digitalmars-d-learn]

On Saturday, 28 November 2015 at 18:57:53 UTC, anonymous wrote:
> On 28.11.2015 19:51, Suliman wrote:
>> 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
>
> req is not an HTTPClientRequest, it's an HTTPServerRequest.
>
> http://vibed.org/api/vibe.http.server/HTTPServerRequest

What difference between HTTPClientRequest and HTTPRequest ?