title: node-red wait for async query for http-response
body: <p>I have REST-endpoint done with node-red which do some async tasks, for example odbc-query to the database. </p>
  
  <p>When I'm resulting query to the http-response. It's just hangs on browser.
  Looks like I need forward req and res object to the http-response. But how I do it?</p>
  
  <p>Here is the flow:</p>
  
  <pre><code>[{"id":"a35e6901.509a1","type":"http in","z":"ec714e97.d73b58","name":"","url":"/get","method":"get","upload":false,"swaggerDoc":"","x":287.8571472167969,"y":1660.357177734375,"wires":[["7c116e0a.f8d67"]]},{"id":"98e22918.79bc4","type":"sqldbs","z":"ec714e97.d73b58","mydb":"8df7f8b0.bd44c","querytype":"select","name":"","x":723.5714111328125,"y":1644.6428833007812,"wires":[["de837ef9.5c1cf8"]]},{"id":"7c116e0a.f8d67","type":"function","z":"ec714e97.d73b58","name":"","func":"msq.topic = \"Select * from User\"\nreturn msg;","outputs":1,"noerr":0,"x":469.28570556640625,"y":1613.9286499023438,"wires":[["98e22918.79bc4"]]},{"id":"de837ef9.5c1cf8","type":"http response","z":"ec714e97.d73b58","name":"","statusCode":"","headers":{},"x":922.1428833007812,"y":1677.8570861816406,"wires":[]},{"id":"8df7f8b0.bd44c","type":"sqldbsdatabase","z":"","host":"127.0.0.1","port":"1433","db":"test","dialect":"mysql"}]
  </code></pre>