Angularjs - $resource causing a 404 - method: OPTIONS

Angularjs - $resource causing a 404 - method: OPTIONS

I am trying to get a basic $resource request via angularjs. I am running
this on my local computer.
However, I get a 404. A simple get request on the browser loads the json.
Here is the request shown by chrome devtools. (Question: why is the
request mode: OPTIONS? Could that be the problem?)
Request URL:http://example.com/api/rentable_properties.json
Request Method:OPTIONS
Status Code:404 Not Found
Here is my controller that is attempting to make the request:
'use strict';
angular.module('adminApp')
.factory('Property', function($resource)
{
return
$resource('http://example.com/api/rentable_properties.json/:propertyId');
});
angular.module('adminApp')
.controller('PropertiesCtrl', function ($scope, Property, $location) {
$scope.properties = Property.query()