node_with_span.js

node_with_span.js

app.get('/hello', (req, res) => {
  // start a new span named “sleeper”
 const childSpan = tracer.startSpan("sleeper");
 
 // use withSpan to create a new context
 tracer.withSpan(childSpan,()=> {
   setTimeout(()=> {
     // getCurrentSpan now correctly returns childSpan
     const span = tracer.getCurrentSpan();
     span.addEvent('sending response');
     res.status(200).send('Hello World');
     span.end();
   }, 300);
 });
});