It listens on port 8080 on 0.0.0.0 for a POST request to the "/words" endpoint.
If the data in the request is a word we haven't seen before, the server responds with the status code "418 I'm a teapot."
If the data in the request is a word we have seen before, the server responds with the status code "200 OK."
docker build -t server .
docker run -p 0.0.0.0:8080:8080 --name server server
curl -X POST http://127.0.0.1:8080/words --data hi --verbose
During the interview, I was unaware of the fact that localhost from within the Docker container does not connect to the localhost of the host. That's why I was unable to connect to the server once it was running from inside Docker. To fix this, I've changed the host variable in http.js to 0.0.0.0. The Docker command also has to reflect this.
Additionally, the code I had written had a bug in it which the server would always return "OK" even when it had never seen a word before.
That was because I was handling the logic outside of the request.on("end",()) function. Since request.on("data",()) is asynchronous, the logic I had written outside of it was garbage because it was executing before the request data was finished sending. This is fixed now that I've added the request.on("end",()) listener.