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These files are closed, WSGI handler can provide a method called close
and that method is called post-processing of the request.
Django source code (http/request.py)
class HttpRequest:
...
def close(self):
if hasattr(self, '_files'):
for f in chain.from_iterable(list_[1] for list_ in self._files.lists()):
f.close()
Edit:
Django globally configures two types of file uploader InMemory and Temp file. All these classes implement theclose
method, the close method of request
object is registered as _resource_closers
and these methods are called from HttpResponseBase
‘s close
method.
Source:stackexchange.com