  from django.urls import is_valid_path
  from django.utils.cache import (
      cc_delim_re, get_conditional_response, set_response_etag,
  )
  from django.utils.deprecation import MiddlewareMixin
  from django.utils.encoding import force_text
  from django.utils.six.moves.urllib.parse import urlparse
  
  
  class CommonMiddleware(MiddlewareMixin):
 
</s> remove from django.utils.cache import get_conditional_response
 </s> add from django.utils.cache import (
    cc_delim_re, get_conditional_response, set_response_etag,
) </s> remove           appropriately.
 </s> add           appropriately. USE_ETAGS is deprecated in favor of
          ConditionalGetMiddleware.
from django.utils.deprecation import MiddlewareMixin, RemovedInDjango21Warning
  from django.urls import is_valid_path
  from django.utils.cache import (
      cc_delim_re, get_conditional_response, set_response_etag,
  )
from django.utils.deprecation import MiddlewareMixin, RemovedInDjango21Warning
  from django.utils.encoding import force_text
  from django.utils.six.moves.urllib.parse import urlparse
  
  
  class CommonMiddleware(MiddlewareMixin):
keep keep keep keep replace keep keep keep keep keep
 Fixed #26447 -- Deprecated settings.USE_ETAGS in favor of ConditionalGetMiddleware. 
django/middleware/common.py