Google-bigquery how to get datasetlist with https get?

I am trying to get a list of datasets from bigquery webserver with https get

following the documentation: https://developers.google.com/bigquery/docs/reference/v2/datasets/list

I am using slightly modified code:
http://code.google.com/p/qt-google-bigquery/source/browse/manager_bigquery.cpp

getDatasetsList(QString strProjectID)
{
QString url = QString("https://www.googleapis.com/bigquery/v2/projects/%1/datasets?key=%2").arg(str_ProjectID).arg(this->api_key);
//Also tried without ?key= part

QNetworkRequest request;
request.setUrl( QUrl(url) );    //this also urlencodes
request.setRawHeader("Content-Type", "application/json");
request.setRawHeader("Authorization", (QString("Bearer %1").arg(m_Access_Token)).toLatin1());

//here i post the request as a http get asynchronously
}

      

        
        
        
      

    

i will return this error message:

Reply =  "{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "required",
    "message": "Required parameter is missing"
   }
  ],
  "code": 400,
  "message": "Required parameter is missing"
 }
}

      

        
        
        
      

    

Note:
I was able to run the query and get the results, so my access token seems to be valid, what am I doing wrong here?

solved

And, in fact, the problem was in my encoding, not in the request, I posted it as an http message, not getting it.