REQUEST_URI was /test-post-pretty-simple-form.php
POST was Array ( )
GET was Array ( )
This form has no button, nor attributes (method and action are empty). Its tag is very simple:
<form>You can verify this by viewing the source of this page.
Is it possible to submit the form using the Enter key? Try typing some text into the input, and then hit Enter. If the form was submitted, you'll see a question mark with the start of the query string, like "?topping=...".
This page was created in November 2019. I tested it in Chrome. If I type in some text, and hit the Enter key, the form submits. Data is transferred to the server via GET - the $_GET array contains the single input.