POST Method error 411

@Future(callout=true)
   public static void makePostCallout(String jbody) {
   //STring jbody = json.serialize(accs.Value);
System.debug('OLHA O BODY:::::' + jbody);

String ep = 'link to endpoint';

           HttpClient httpObj = new HttpClient('client and pass here'); // Note two forward slashes between domain and username \\ /
//HttpRequest req = new HttpRequest();
   // Http x = new Http();
HttpRequest response = new HttpRequest();
      response.setMethod('POST');
           response.setEndpoint(ep);

           response.setbody(jbody);
           response.setHeader('Content-Type', 'application/soap+xml;charset=UTF-8');

           response.setHeader('Accept','application/json');
           response.setHeader('Content-Length', '512');
           response.setHeader('Content-Transfer-Encoding','base64');
           response.setHeader('KeepAlive','true');
           response.setCompressed(true);

           System.debug('OLHA O BODYAGORA :::::' + response.getBody());
           HttpResponse res2 = httpobj.send(response);
           system.debug('RESPOSTA DO FUTURE::::::::' + res2.getbody());
}

This code when trying to post updates to server keeps giving me the error 411 like this :
16:18:13:000 USER_DEBUG <HTML><HEAD><TITLE>Length Required</TITLE>
16:18:13:000 USER_DEBUG <META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>
16:18:13:000 USER_DEBUG <BODY><h2>Length Required</h2>
16:18:13:000 USER_DEBUG <hr><p>HTTP Error 411. The request must be chunked or have a content length.</p>
16:18:13:000 USER_DEBUG </BODY></HTML>

Am I doing something wrong???