createBucket: function createBucket(params, callback) {
    // When creating a bucket *outside* the classic region, the location
    // constraint must be set for the bucket and it must match the endpoint.
    // This chunk of code will set the location constraint param based
    // on the region (when possible), but it will not override a passed-in
    // location constraint.
    if (typeof params === 'function' || !params) {
      callback = callback || params;
      params = {};
    }
    var hostname = this.endpoint.hostname;
    // copy params so that appending keys does not unintentioinallly
    // mutate params object argument passed in by user
    var copiedParams = AWS.util.copy(params);
    if (hostname !== this.api.globalEndpoint && !params.CreateBucketConfiguration) {
      copiedParams.CreateBucketConfiguration = { LocationConstraint: this.config.region };
    }
    return this.makeRequest('createBucket', copiedParams, callback);
  },