'Jupyter connection closed while downloading large file

I try to download file from my juputerhub notebook with 'download' button.When the file's smaller than 100mb,everything works fine.But when the file is larger than 100mb,it comes with "503:service uavalable"."503 connection closed" in log file.I assume there maybe some error with my "jupyterhub_config.py",but how can i fix it



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