So, we took a step back in our project and deployed an Hello World 
application to see if the problem would still happen.

We used the hello-world example in the Google App Engine code examples and 
edited it (our file is attached): there are no differences,
but the fact that we don't have a *.end()* call after we send the response 
to the client *res.status(200).send(): *we edited the code 
removing the .end() because that is how we do in our project.

We don't think this is the problem. as explained here 
<https://stackoverflow.com/questions/20355136/must-res-end-be-called-in-express-with-node-js>
 and 
seeing that the Express code for *res.send()* does in fact call a 
*res.end()* itself.

Anyway, after the hello-world deployment, we still got a 502 Bad Gateway.

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'use strict';

const express = require('express');

const app = express();

app.get('/_ah/health', function (req, res) {
  res.sendStatus(200);
});

app.post('/data1.aspx', (req, res) => {
  res.status(200).send();
});

const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`App listening on port ${PORT}`);
  console.log('Press Ctrl+C to quit.');
});
  • [google-appengine]... Marco Galassi
    • [google-appen... 'Jordan (Cloud Platform Support)' via Google App Engine
      • [google-a... 'Jordan (Cloud Platform Support)' via Google App Engine
        • [goog... Marco Galassi
          • [... 'Jordan (Cloud Platform Support)' via Google App Engine
            • ... Marco Galassi
              • ... 'Jordan (Cloud Platform Support)' via Google App Engine
                • ... Marco Galassi
                • ... 'Jordan (Cloud Platform Support)' via Google App Engine
                • ... Marco Galassi
                • ... Jonas Klemming
    • [google-appen... Marco Galassi

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