Java HttpURLConnection OutputStreamWriter is empty -

i know has been answered 10,000+ times. have been reading , testing recommendations on hour without progress.

in code below, request body empty.

url url = new url("[removed]"); httpurlconnection conn = (httpurlconnection)url.openconnection(); conn.setrequestproperty("authorization", "bearer [removed]"); conn.setrequestmethod("post"); conn.setrequestproperty("content-type","application/json"); conn.setdooutput(true); conn.setdoinput(true); outputstreamwriter writer = new outputstreamwriter(conn.getoutputstream()); writer.write("abc"); writer.flush(); writer.close();  string line; bufferedreader reader = new bufferedreader(new                               inputstreamreader(conn.getinputstream())); while ((line = reader.readline()) != null) {   system.out.println(line); }  reader.close(); 

the record created on server, body null.

any appreciated.

the exact same code not work on localhost works on app engine. don't understand why, code above works.