curl -X POST http://localhost:8081/deleteStars 
curl -X POST http://localhost:8081/deleteNodes 
curl -X POST --data "w=1000" http://localhost:8081/new
curl -X POST --data "x=10&y=20&vx=0.1&vy=0.3&m=100&index=1" http://localhost:8081/insertStar