AngularJS module that can be reused in multiple Angular modules that are making POSTs to the backend.

angular-post-fix.js

// Modifies $httpProvider for correct server communication (POST variable format)
angular.module('http-post-fix', [], function($httpProvider) {
  // This code is taken from http://victorblog.com/2012/12/20/make-angularjs-http-service-behave-like-jquery-ajax/
  
  // Use x-www-form-urlencoded Content-Type
  $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=utf-8';

  // Override $http service's default transformRequest
  $httpProvider.defaults.transformRequest = [function(data) {
    /**
     * The workhorse; converts an object to x-www-form-urlencoded serialization.
     * @param {Object} obj
     * @return {String}
     */ 
    var param = function(obj) {
      var query = '';
      var name, value, fullSubName, subValue, innerObj, i;
      
      for(name in obj) {
        value = obj[name];
        
        if(value instanceof Array) {
          for(i=0; i<value.length; ++i) {
            subValue = value[i];
            fullSubName = name + '[' + i + ']';
            innerObj = {};
            innerObj[fullSubName] = subValue;
            query += param(innerObj) + '&';
          }
        } else if(value instanceof Object) {
          for(subName in value) {
            subValue = value[subName];
            fullSubName = name + '[' + subName + ']';
            innerObj = {};
            innerObj[fullSubName] = subValue;
            query += param(innerObj) + '&';
          }
        } else if(value !== undefined && value !== null) {
          query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&';
        }
      }
      
      return query.length ? query.substr(0, query.length - 1) : query;
    };
    
    return angular.isObject(data) && String(data) !== '[object File]' ? param(data) : data;
  }];
});

Jens, thanks for making this. I recently pushed a fix to my blog post. For line 17, if you put subName in the list of declarations, it will ensure that that var is not shadowing global of the same name. Thanks again!

The current name of the module in the downloaded file is 'httpPostFix', and not 'http-post-fix'.

Cheers
Edit :
Using ng-strict-di 😄

// Orginal code from: http://victorblog.com/2012/12/20/make-angularjs-http-service-behave-like-jquery-ajax/
// Copyrights: Ezekiel Victor

// Modifies $httpProvider for correct server communication (POST variable format)
angular.module('httpPostFix', [], ['$httpProvider', function($httpProvider)
{
// Use x-www-form-urlencoded Content-Type
$httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=utf-8';

// Override $http service's default transformRequest
$httpProvider.defaults.transformRequest = [function(data)
{
    /**
     * The workhorse; converts an object to x-www-form-urlencoded serialization.
     * @param {Object} obj
     * @return {String}
     */
    var param = function(obj)
    {
        var query = '';
        var name, value, fullSubName, subName, subValue, innerObj, i;

        for(name in obj)
        {
            value = obj[name];

            if(value instanceof Array)
            {
                for(i=0; i<value.length; ++i)
                {
                    subValue = value[i];
                    fullSubName = name + '[' + i + ']';
                    innerObj = {};
                    innerObj[fullSubName] = subValue;
                    query += param(innerObj) + '&';
                }
            }
            else if(value instanceof Object)
            {
                for(subName in value)
                {
                    subValue = value[subName];
                    fullSubName = name + '[' + subName + ']';
                    innerObj = {};
                    innerObj[fullSubName] = subValue;
                    query += param(innerObj) + '&';
                }
            }
            else if(value !== undefined && value !== null)
            {
                query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&';
            }
        }

        return query.length ? query.substr(0, query.length - 1) : query;
    };

    return angular.isObject(data) && String(data) !== '[object File]' ? param(data) : data;
}];

}]);

Still doesn't work with $http.put

I had to modify the script slightly in order to make it work with angular 1.3 (migrated from 1.2 to 1.3). Let me know, if I made something wrong:

        // Use x-www-form-urlencoded Content-Type
        $httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=utf-8';
        $httpProvider.defaults.headers.put['Content-Type'] = 'application/x-www-form-urlencoded;charset=utf-8';

    /**
         * The workhorse; converts an object to x-www-form-urlencoded serialization.
         * @param {Object} obj
         * @return {String}
         */
        var param = function (obj) {
            var query = '', name, value, fullSubName, subName, subValue, innerObj, i;

            angular.forEach(obj, function(value, name) {
+                if(name.indexOf("$promise") != -1) {
+                    return;
+                }
                value = obj[name];


                if (value instanceof Array) {
                    for (i = 0; i < value.length; ++i) {
                        if(name == "$promise") {
                            continue;
                        }
                        subValue = value[i];
                        fullSubName = name + '[' + i + ']';
                        innerObj = {};
                        innerObj[fullSubName] = subValue;
                        query += param(innerObj) + '&';
                    }
                }
                else if (value instanceof Object) {
                    for (subName in value) {
                        subValue = value[subName];
                        fullSubName = name + '[' + subName + ']';
                        innerObj = {};
                        innerObj[fullSubName] = subValue;
                        query += param(innerObj) + '&';
                    }
                }
                else if (value !== undefined && value !== null)
                    query += encodeURIComponent(name) + '=' + encodeURIComponent(value) + '&';
            });

            return query.length ? query.substr(0, query.length - 1) : query;
        };