class_docstr: Manage the invocation of a WSGI application
class_docstr_tok: ["Manage","the","invocation","of","a","WSGI","application"]
docstr: Override in subclass to force sending of recent '_write()' calls
  
  It's okay if this method is a no-op (i.e., if '_write()' actually
  sends the data.
docstr_tok: ["Override","in","subclass","to","force","sending","of","recent","'_write","(",")","'","calls","It","'s","okay","if","this","method","is","a","no-op","(","i.e.",",","if","'_write","(",")","'","actually","sends","the","data","."]
code: def _flush(self):
      """Override in subclass to force sending of recent '_write()' calls
  
      It's okay if this method is a no-op (i.e., if '_write()' actually
      sends the data.
      """
      raise NotImplementedError
  
imports: from .util import FileWrapper, guess_scheme, is_hop_by_hop
  from .headers import Headers
  import sys, os, time
label_desc: Use image node_id 21 for calling the BaseHandler obj's underlying member method code with example usage: obj._flush() without return types