Context

• We have mock APIs which send a request to the earth911's API and then forward its response to the client
  • /earth911.getPostalData
  • /earth911.searchLocations
  • /earth911.getLocationDetails
• If you hit any of these API endpoints, with an invalid api_key query parameter, and hit the endpoint again with valid one, you should see the error in the terminal
• I believe this is because there are missing return statements in the controllers for these endpoints.
• Example,

router.get("/", async (req, res) => {
  if (req.query.api_key !== "dummykey") {
    res.send({ err: "invalid key" });
  }
  const country = req.query.country;
  const postalCode = req.query.postal_code;

  const API_KEY = process.env.API_KEY;

  try {
    const data = await fetchData(
      `http://api.earth911.com/earth911.getPostalData?api_key=${API_KEY}&country=${country}&postal_code=${postalCode}`
    );

    res.send(data);
  } catch (error) {
    console.log("ERROR: ", error);
  }
});

here, instead of res.send({ err: "invalid key" });, there should be return res.send({ err: "invalid key" });
This will sure that the response is sent and the function call is also over.