code: def get_task_arg(self) -> str:
      task = self.get_query_argument("t", "")
      assert len(task) > 0
      return task
  
imports: import os
  import os.path
  import argparse
  from typing import List
  from vizseq._utils.logger import logger
  from vizseq._view import VizSeqWebView, DEFAULT_PAGE_SIZE, DEFAULT_PAGE_NO
  from vizseq._data.zip_file import VizSeqZipFile
  from vizseq._data import get_g_translate, VizSeqGlobalConfigManager
  from vizseq._visualizers import SPAN_HIGHTLIGHT_JS
  from vizseq._utils import VizSeqJson
  from vizseq import __version__
  from tornado import web, ioloop
  from jinja2 import Environment, PackageLoader, select_autoescape
label_desc: Use image node_id 2 for calling the VizSeqBaseRequestHandler obj's underlying member method code with example usage: obj.get_task_arg() and returns: task