code: def _create_csp_string(*csp_fragments):
      csp_string = " ".join([frag for frag in csp_fragments if frag])
      return csp_string if csp_string else "'none'"
  
file_path: tensorboard/tensorboard/backend/http_util.py
imports: import gzip
  import io
  import json
  import re
  import struct
  import time
  import wsgiref.handlers
  import werkzeug
  from tensorboard.backend import json_util
label_desc: Use image node_id 2 for calling a global function with example usage: _create_csp_string() and returns: unknown