I am having difficulty passing information from client to server in AWS Cloud9 using nodejs

Question

I have a question about AWS Cloud9 and nodejs.

I am using this nodejs tutorial to teach myself how to communicate between client side and server side:

https://dev.to/gbudjeakp/how-to-connect-your-client-side-to-your-server-side-using-node-and-express-2i71

I followed the tutorial and set it up on my laptop and everything worked fine. I even was able to figure out how to write the data sent from the client to a file using writeFileSync.

The problem is in trying to get it to work while on the Amazon Web Service Cloud9 integrated development environment.

When I run the index.js file by itself on Cloud9, I get the message stating that the server is running on port 8080, as expected.

However, I cannot get the HTML file to interface with the index.js file. The HTML file contains a form that is supposed to send the form content to index.js.

I believe the problem is in the address contained in the HTML form. I have researched and tried several different configurations, but none of them work. Currently, the form looks like this:

<form action="https://localhost:8080/login" method="POST">
        <input type="text" name="username" placeholder="username">
        <input type="text" name="password" placeholder="password">
        <button type="submit">Login</button>
    </form>

Using localhost:8080 results in an error message of "localhost refused to connect."

When I have used variations of my username and AWS project name, I receive an error stating that the server IP address could not be found.

Any help would be appreciated.