Once we run the program, the HTTP server will start locally listening on port 8080. Browsing http://localhost:8080 will show us an HTML form, as shown in the following screenshot:
Then submit the form with the valid values:
It will show us the Hello followed by the username on a browser screen, as shown in the following screenshot:
Submitting the form with the value as non-alpha in any of the fields will show us the error message. ...
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