class_docstr: Provide a mechanism for Bokeh applications to build up new Bokeh
  Documents.
class_docstr_tok: ["Provide","a","mechanism","for","Bokeh","applications","to","build","up","new","Bokeh","Documents","."]
code: def __init__(self) -> None:
      self._failed = False
      self._error = None
      self._error_detail = None
      self._static = None
  
imports: from __future__ import annotations
  import logging
  import os
  import sys
  import traceback
  from typing import TYPE_CHECKING, Any
  from ...document import Document
  from ..application import ServerContext, SessionContext
label_desc: Use image node_id 1 to create a new Handler object  with example: obj = Handler()