[Python] Why do I get a 501 error when submitting an AJAX POST request to a SimpleHTTPServer?

I'm having problems calling php functions from javascript. I have tried some of the suggestions on stackoverflow without any success. I'm not sure what I'm missing here...

I'm writing to submit a simple POST request to my php file, but I get this error in my browser console:

POST http://localhost:8000/myphp.php 501 (Unsupported method ('POST'))


I'm writing a single page web app that is currently running on my local machine with a simple server running at /projecthome/

python -m SimpleHTTPServer


My files are laid out like this:

/projecthome/index.html
/projecthome/myphp.php
/projecthome/js/myjs.js


index.html:

...
<script src="js/myjs.js" type="text/javascript"></script>
<script>
$(function() {
run();
});
</script>
...


myjs.js:

function schemaCreationTool() {
var id='someID';

$.ajax({
url: 'myphp.php',
type: 'POST',
data: {id:id},
success: function(data) {
console.log(data);
}
});
}


myphp.php:

<?php

if (isset($_POST['id'])) {
select($_POST['id']);
}

function select($x) {
echo "The select function is called.";
}
}


I followed solutions from these posts:

calling a php function in javascript

Call php function from javascript and send parameter

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