servers.py 文件源码

def serve(private_file):
        # Support If-Last-Modified
        mtime = private_file.modified_time.timestamp()
        size = private_file.size
        if not was_modified_since(private_file.request.META.get('HTTP_IF_MODIFIED_SINCE'), mtime, size):
            return HttpResponseNotModified()

        # As of Django 1.8, FileResponse triggers 'wsgi.file_wrapper' in Django's WSGIHandler.
        # This uses efficient file streaming, such as sendfile() in uWSGI.
        # When the WSGI container doesn't provide 'wsgi.file_wrapper', it submits the file in 4KB chunks.
        response = FileResponse(private_file.open())
        response['Content-Type'] = private_file.content_type
        response['Content-Length'] = size
        response["Last-Modified"] = http_date(mtime)
        return response