[Python] SocketIO connection disconnects when sending data about 1mb over it through nginx...

I've socketio connection in python flask that I can connect to it directly and send data over it without any problem, but when I use nginx as webserver and reverse_proxy and pass socketio connection via it, the connection disconnects when I send large data, about 1MB. `

I used many nginx options, such as:

location /socket.io {
proxy_buffering off;
proxy_pass http://backend;
proxy_http_version 1.1;
large_client_header_buffers 4 16k;
client_body_buffer_size 100M;
proxy_buffering off;
proxy_buffers 8 5M;
proxy_buffer_size 5M;
proxy_read_timeout 300s;
proxy_send_timeout 300s;
proxy_buffering off; # Disable buffering for WebSocket`

How can I resolve this issue?

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