Web server not accepting POST fields sent by HTTP Requester

[NobleUplift]

Here's my POST request:

POST http://localhost/rest/version/delete.php
Content-Type: application/x-www-form-urlencoded
Content-Length: 24

ids=950313&enabled=false

I copy and paste "ids=950313&enabled=false" into the Content box after clicking "Parameter Body". However, when I POST the request, my web server reports receiving no POST parameters. Specifically, it is PHP 5.5 and the $_POST array is empty.