Provide the 'return_url' in the allocate slots view
This url can then be used to post and receive JSON data from.
Patch by: Sverre Rabbelier
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html lang="en">
<head>
<title>404 Not Found</title>
</head>
<body><h1>404 Not Found</h1></body>
</html>