code: def from_environ(environ):
      """Get a `RequestContext` from a WSGI environment.
  
      See also `set_in_environ`.
  
      Args:
        environ: A WSGI environment (see PEP 3333).
  
      Returns:
        The `RequestContext` stored in the WSGI environment, or an empty
        `RequestContext` if none is stored.
      """
      result = environ.get(_WSGI_KEY)
      return result if result is not None else RequestContext()
  
file_path: tensorboard/tensorboard/context.py
imports: from tensorboard import auth
label_desc: Use image node_id 1 for calling a global function with example usage: from_environ(environ) and returns: unknown