I remember that the post needs to be converted in the background before it can be retrieved. . . The code has been available online for a long time. . try it yourself?
If you have garbled Chinese characters, you can try encoding,

`app.config(function($httpProvider) {
$httpProvider.defaults.headers.put['Content-Type'] = 'application/x-www-form-urlencoded';
$httpProvider.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';

    // 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;
    }];
});`

jsapp.factory('HttpInterceptor', function() {
  // ---
  // PRVIATE METHODS.
  // ---
  // I serialize the given Object into a key-value pair string. This
  // method expects an object and will default to the toString() method.
  // --
  // NOTE: This is an atered version of the jQuery.param() method which
  // will serialize a data collection for Form posting.
  // --
  // https://github.com/jquery/jquery/blob/master/src/serialize.js#L45
  function serializeData(data) {
    // If this is not an object, defer to native stringification.
    if (!angular.isObject(data)) {
      return ((data == null) ? "" : data.toString());
    }
    var buffer = [];
    // Serialize each key in the object.
    for (var name in data) {
      if (!data.hasOwnProperty(name)) {
        continue;
      }
      var value = data[name];
      buffer.push(
        encodeURIComponent(name) +
        "=" +
        encodeURIComponent((value == null) ? "" : value)
      );
    }
    // Serialize the buffer and clean it up for transportation.
    var source = buffer
      .join("&")
      .replace(/%20/g, "+");
    return (source);
  }
  return {
    request: function(config) {
      if (config.method === 'POST') {
        if (config.data) {
          config.headers = config.headers || {};
          config.headers["Content-Type"] = "application/x-www-form-urlencoded; charset=utf-8";
          config.data = serializeData(config.data);
        }
      }
      return config;
    }
  };
})