Function $http

test/angular/1.5/angular.js:11683–11834

* @ngdoc service * @kind function * @name $http * @requires ng.$httpBackend * @requires $cacheFactory * @requires $rootScope * @requires $q * @requires $injector * * @description * The `$http` service is a core Angular service that facilitates commun

(requestConfig)

</example>
     */
    function $http(requestConfig) {

      if (!isObject(requestConfig)) {
        throw minErr('$http')('badreq', 'Http request configuration must be an object.  Received: {0}', requestConfig);
      }

      if (!isString(requestConfig.url)) {
        throw minErr('$http')('badreq', 'Http request configuration url must be a string.  Received: {0}', requestConfig.url);
      }

      var config = extend({
        method: 'get',
        transformRequest: defaults.transformRequest,
        transformResponse: defaults.transformResponse,
        paramSerializer: defaults.paramSerializer
      }, requestConfig);

      config.headers = mergeHeaders(requestConfig);
      config.method = uppercase(config.method);
      config.paramSerializer = isString(config.paramSerializer) ?
          $injector.get(config.paramSerializer) : config.paramSerializer;

      var requestInterceptors = [];
      var responseInterceptors = [];
      var promise = $q.when(config);

      // apply interceptors
      forEach(reversedInterceptors, function(interceptor) {
        if (interceptor.request || interceptor.requestError) {
          requestInterceptors.unshift(interceptor.request, interceptor.requestError);
        }
        if (interceptor.response || interceptor.responseError) {
          responseInterceptors.push(interceptor.response, interceptor.responseError);
        }
      });

      promise = chainInterceptors(promise, requestInterceptors);
      promise = promise.then(serverRequest);
      promise = chainInterceptors(promise, responseInterceptors);

      if (useLegacyPromise) {
        promise.success = function(fn) {
          assertArgFn(fn, 'fn');

          promise.then(function(response) {
            fn(response.data, response.status, response.headers, config);
          });
          return promise;
        };

        promise.error = function(fn) {
          assertArgFn(fn, 'fn');

          promise.then(null, function(response) {
            fn(response.data, response.status, response.headers, config);
          });
          return promise;
        };