Access-Control-Allow-Headers AngularJS不允许请求标头字段Content-Type

Question

I am working on an API module that makes CORS requests to the service endpoint:
https://github.com/gigablox/angular-blitline-api

See the demonstration here:
http://plnkr.co/FjnJbHQHG5MM7P0VbtV6

You will notice when the API call is made I receive the following error message:
Request header field Content-Type is not allowed by Access-Control-Allow-Headers

I've open sourced a few of these API modules before for --- Imgur , Mandrill , and Blogger --- but this is the first time I've ever seen this problem using Blitline .

Is there an issue in my code or does the service provider not like the way the request is being sent to them because of some AngularJS $http convention?

I was able to find a related topic however the solution provided did not work.
delete $httpProvider.defaults.headers.common['X-Requested-With'];
Feel free to try it with that plunker --- I should note I am using 1.1.5

Answer 1

Update

Your plnkr worked for me... sort of. I get the following response:

{"results":"Sorry, 'json' key expected in post data. For example { \"json\": \"{...}\" }. Please check the Blitline examples."}

According to the docs :

A job is a collection of 1 or more functions to be performed on an image. Data submitted to the job api must have a key of "json" and a value that is a string. The string must contain properly formatted JSON.

You should be submitting your POST in a format like this:

angular.module('myApp', ['blitline'])

.config(['$blitlineGlobalProvider', function($blitlineGlobalProvider) {
  $blitlineGlobalProvider.options({
        json: '{"application_id": "YOUR_ID","version": 2,"src": "http://cdn.blitline.com/filters/boys.jpeg","functions": [{"name": "resize_to_fit","params": {"width": 240,"height": 140},"save": {"image_identifier": "external_sample_1"}}]}'
    });
}])

.controller('blitlineTest', ['$scope', '$blitlineJob', function($scope, $blitlineJob) {
    var blitlineJob = $blitlineJob.blitlineJob();
    blitlineJob.job(function(job) {
        console.log(job);
    });
}]);

Here is an updated plnkr: http://plnkr.co/edit/qV7sEf?p=preview

Bitline has a working example on their site You can see it here: http://www.blitline.com/docs/sample