app.get('/',(req,res)=>{
res.send('<b>hello</b>');
});
app.get('/',(req,res)=>{
res.send({msg:'hello'});
});
app.get('/',(req,res)=>{
res.end('<b>hello</b>');
});
https://stackoverflow.com/questions/29555290/what-is-the-difference-between-res-end-and-res-send
https://jos50275266.medium.com/what-is-the-difference-between-response-send-response-end-and-response-write-c0457dba3ce2