If you are one of those who leave the docs as a last resort, you may find that when doing ajax requests with Prototype all requests except get and post are emulated using post and adding a _method parameter.
The code doing this is in ajax.js:
if (!['get', 'post'].include(this.method)) {
// simulate other verbs over post
params['_method'] = this.method;
this.method = 'post';
}
The documentation about this is here: http://www.prototypejs.org/api/ajax/options
The reason for using _method is because not all browsers support delete / put, according to ticket 289, which is a request to change this behaviour.
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