upload issue when NGINX actes as reverse proxy

[Web George]

Hi all:

I met an issue when I use NGINX.

When NGINX works as reverse proxy, I try to upload about 300M file to the
backend webserver, I failed.

1) I change the entry "client_max_body_size 300m" in nginx.conf, but I still
fail.
2) It seems that the file is cached by nginx,then re-transmit to backend.
  If I want to upload 1GB size file and there is no enough memory in
reverse-server, it is fail also?

3) can we set bypass the file uploading ?

anyone can give me some help?

thanks
George
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