cURL POST Request with ofSystem from openFrameworks

cURLinOF.cpp

string completeUpdate = "{\"requests\": [{\"method\": \"PUT\",\"path\": \"/1/classes/"+dbName+"/"+displayObjectId+"\",\"body\": "+ updateObj + "},{\"method\": \"PUT\",\"path\": \"/1/classes/"+dbName+"/"+displayObjectId+"\",\"body\": " + updateObj2 + "}]}";
string someId = "someIdString";

pushData(someId, completeUpdate);

void pushData(string someIdStr, string updateObjectStr){
 
    cout << "updating parse. objectId: "<<someIdStr<<endl;
    cout << "\tupdate object: "<<updateObjectStr<<endl;
    
    string cmd = "curl -X POST \
    -H \"X-Parse-Application-Id: QKfYTmyApplicationIdyeadCeakCmfwa\" \
    -H \"X-Parse-REST-API-Key: cGN5GZgtOYuf2myRESTApiKeya1t1OaszbNB\" \
    -H \"Content-Type: application/json\" \
    -d '"+updateObjectStr+"' \
    https://my.apiserver.com/1/batch";
    
    ofSystem( cmd );
}

Any thoughts on a GET request ?