Angular $http.post not returning XML

Question

I am trying to call a web service with angular, but not having much luck. The service takes a POST request with no POST body, and returns XML. I can confirm that the service works with a raw XMLHttpRequest call:

var xhr = new XMLHttpRequest();

xhr.onreadystatechange = function(){
  if(xhr.readyState == 4)
    console.log(xhr.responseText); // Returns data
}

xhr.open("POST", "https://api.bmreports.com/BMRS/MessageListRetrieval/v1/?APIKey=9eu73tsryf1sons&ParticipantId=INNOGY01&PublicationFrom=1970-01-01&PublicationTo=3000-01-01&ServiceType=XML", true);

xhr.send(null);

And with jQuery:

$.ajax({
  url: 'https://api.bmreports.com/BMRS/MessageListRetrieval/v1/?APIKey=9eu73tsryf1sons&ParticipantId=INNOGY01&PublicationFrom=1970-01-01&PublicationTo=3000-01-01&ServiceType=XML',
  type: "POST",
  success: function(data){
    console.log(data); // Returns data
  },
  error: function (hxr, status, errorThrown){
    console.log(status);
  }
});

However, I'm not getting anything back when I try it with angular's $http service:

angular.module('TestApp',[])
.controller('TestController', function($scope, $http){
    $http({
        method: "POST",
        url: 'https://api.bmreports.com/BMRS/MessageListRetrieval/v1/?APIKey=9eu73tsryf1sons&ParticipantId=INNOGY01&PublicationFrom=1970-01-01&PublicationTo=3000-01-01&ServiceType=XML'
    }).success(function(data, status, headers, config){
        console.log("data:");
        console.log(data); // Returns null
    }).error(function(data, status, headers, config){
        console.log("error status:");
        console.log(status); // No errors returned      
    })
})

EDIT: Using the $http.post shortcut method:

angular.module('TestApp',[])
.controller('TestController', function($scope, $http){
    $http.post(
        'https://api.bmreports.com/BMRS/MessageListRetrieval/v1/?APIKey=9eu73tsryf1sons&ParticipantId=INNOGY01&PublicationFrom=1970-01-01&PublicationTo=3000-01-01&ServiceType=XML'
    ).success(function(data, status, headers, config){
        console.log("data:");
        console.log(data);
    }).error(function(data, status, headers, config){
        console.log("error status:");
        console.log(status);        
    })
})

Note that the $http.post shortcut method has a second data parameter, but I have no data to pass. If I include the parameter as null, Chrome says:

Request header field Content-Type is not allowed by Access-Control-Allow-Headers

Since the $http.post shortcut method does not complain about missing out the data parameter, I have deliberately missed it out.

I need to be able to make the POST call with no data, as is possible with a raw XMLHttpRequest call, or jQuery's ajax method. What might be going wrong? Thanks!

(NB, the API is public, so don't worry about the API key I've posted. It's a valid API key, which I'll keep active only while this question is open)

Answer 1

Angular by default expecting to get JSON from your server you can change that by adding

 var app = angular.module('app', []); app.controller('homeCtrl', function($scope, $http) { $scope.xml = ""; $http({ method: "POST", url: 'https://api.bmreports.com/BMRS/MessageListRetrieval/v1/?APIKey=9eu73tsryf1sons&ParticipantId=INNOGY01&PublicationFrom=1970-01-01&PublicationTo=3000-01-01&ServiceType=XML', headers: { "Accept": "application/xml" } }).success(function(data, status, headers, config) { console.log("data:"); console.log(data); // Returns null $scope.xml = data; }).error(function(data, status, headers, config) { console.log("error status:"); console.log(status); // No errors returned }) }); 

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app="app"> <div ng-controller="homeCtrl"> {{xml}} </div> </div> 

to your request