code: function(id, responseParser) {
              var lastChunkIdx = handler._getTotalChunks(id) - 1,
                  xhr = handler._getXhr(id, lastChunkIdx);
  
              if (responseParser) {
                  return new qq.Promise().success(responseParser(xhr), xhr);
              }
  
              return new qq.Promise().success({}, xhr);
          }
docs: Called when all chunks have been successfully uploaded.  Expected promissory return type. This defines the default behavior if nothing further is required when all chunks have been uploaded.