curl -o myraw.data --data-urlencode "userName=tutu&password=xx"  'https://servicewelt.stiebel-eltron.de/api/login?noCacheDummyValue=1458825357449'
 -H 'Host: servicewelt.stiebel-eltron.de' -H 'User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Firefox/45.0'
 -H 'Accept: application/json, text/plain, */*' -H 'Accept-Language: en-US,en;q=0.5' -H 'Accept-Encoding: gzip, deflate, br'
 -H 'X-Requested-With: XMLHttpRequest'
 -H 'Content-Type: application/json;charset=utf-8'
 -H 'Referer: https://servicewelt.stiebel-eltron.de/mobile/app/app.html'
 -H 'Content-Length: 44' -H 'Cookie: JSESSIONID=1m5aputqimremdk95fgbtmgo9'
 -H 'Proxy-Authorization: Basic ??' -H 'DNT: 1'
 -H 'Connection: keep-alive'