feat($http): add a default content type for PATH requests

The default header is now application/json which while not perfect
in all cases is better than the browser default application/xml.

The new headers also makes for better compatibility with Rails 4

src/ng/http.js

@@ -123,7 +123,8 @@ function isSuccess(status) {
 function $HttpProvider() {
  var JSON_START = /^\s*(\[|\{[^\{])/,
  JSON_END = /[\}\]]\s*$/,
- PROTECTION_PREFIX = /^\)\]\}',?\n/;
+ PROTECTION_PREFIX = /^\)\]\}',?\n/,
+ CONTENT_TYPE_APPLICATION_JSON = {'Content-Type': 'application/json;charset=utf-8'};
 
  var defaults = this.defaults = {
  // transform incoming response data
@@ -147,8 +148,9 @@ function $HttpProvider() {
  common: {
  'Accept': 'application/json, text/plain, */*'
  },
- post: {'Content-Type': 'application/json;charset=utf-8'},
- put: {'Content-Type': 'application/json;charset=utf-8'}
+ post: CONTENT_TYPE_APPLICATION_JSON,
+ put: CONTENT_TYPE_APPLICATION_JSON,
+ patch: CONTENT_TYPE_APPLICATION_JSON
  },
 
  xsrfCookieName: 'XSRF-TOKEN',
@@ -340,7 +342,7 @@ function $HttpProvider() {
  *
  * A custom default cache built with $cacheFactory can be provided in $http.defaults.cache.
  * To skip it, set configuration property `cache` to `false`.
- * 
+ *
  *
  * # Interceptors
  *
@@ -873,8 +875,8 @@ function $HttpProvider() {
 
 
  if ((config.cache || defaults.cache) && config.cache !== false && config.method == 'GET') {
- cache = isObject(config.cache) ? config.cache 
- : isObject(defaults.cache) ? defaults.cache 
+ cache = isObject(config.cache) ? config.cache
+ : isObject(defaults.cache) ? defaults.cache
  : defaultCache;
  }
 

test/ng/httpSpec.js

@@ -684,6 +684,15 @@ describe('$http', function() {
  $httpBackend.flush();
  });
 
+ it('should set default headers for PATCH request', function() {
+ $httpBackend.expect('PATCH', '/url', 'messageBody', function(headers) {
+ return headers['Accept'] == 'application/json, text/plain, */*' &&
+ headers['Content-Type'] == 'application/json;charset=utf-8';
+ }).respond('');
+
+ $http({url: '/url', method: 'PATCH', headers: {}, data: 'messageBody'});
+ $httpBackend.flush();
+ });
 
  it('should set default headers for custom HTTP method', function() {
  $httpBackend.expect('FOO', '/url', undefined, function(headers) {