HTTP Function hangs when debugging

[jasonpolites]

Description

I have a simple HTTP function, literally copied from the default function that you get when you create a new HTTP Function in the UI:

exports.helloWorld = function helloWorld(req, res) {
  // Example input: {"message": "Hello!"}
  if (req.body.message === undefined) {
    // This is an error case, as "message" is required.
    res.status(400).send('No message defined!');
  } else {
    // Everything is okay.
    console.log(req.body.message);
    res.status(200).send('Success: ' + req.body.message);
  }
};

When debugging (with default emulator setting) using Visual Studio Code, I "attach" to the emulator (after having started with --debug) and my break point fires after issuing a curl command from the terminal. Hitting "play" in VS Code seems to cause execution to continue, but the function doesn't return from the curl command

[jmdobry]

I was able to reproduce this issue with 1.0.0-alpha.6, but it appears to be fixed by #55