nginx+uwsgi 504 Bad Gateway Time-Out

Hello, I have encountered the following issue. After several days of testing, I have come to the conclusion and the logs are as follows. I am not sure if it is my setup error or the original Luci ssl nginx bug. Please help me analyze it. Thank you very much.

Maintainer: @<github-user>
Environment: (x86_64, x86_64, LEDE for Lean)

Description:

When I used Docker to pull the image, onlyOffice/documentserver: latest, and downloaded it for 1 minute, I noticed that it
 happened to be 60 seconds, and suddenly returned 504. Then, I switched to uhtpd and did the same operation without this 
problem. I tried to set many parameters for nginx and modify the parameters for uwsgi, but to no avail, I returned an error very
 accurately at 60 seconds. But if I remove smaller images such as nginx, this problem will not occur.
The following are the logs of nginx and logread:

The nginx logs:

2024/02/13 14:48:14 [error] 3132#0: *22 upstream prematurely closed connection while reading response header from upstream, client: 192.168.1.157, server: _lan, request: "POST /cgi-bin/luci/admin/docker/images HTTP/1.1", upstream: "uwsgi://unix:////var/run/luci-webui.socket:", host: "192.168.1.229", referrer: "https://192.168.1.229/cgi-bin/luci/admin/docker/images"

The uwsgi logs

/etc/uwsgi/vassals/luci-webui.ini is ready to accept requests
Tue Feb 13 14:47:23 2024 daemon.err uwsgi[31940]: Tue Feb 13 14:47:23 2024 - [emperor] vassal /etc/uwsgi/vassals/luci-webui.ini is now loyal
Tue Feb 13 14:48:14 2024 daemon.info uwsgi-luci: invalid CGI response !!!
Tue Feb 13 14:48:14 2024 daemon.err dockerd[13056]: time="2024-02-13T06:48:14.918256230Z" level=error msg="Not continuing with pull after error: context canceled"

Run Env

• LEDE(LEAN) of OpenWRT
• NGINX: 1.21.3
• Packege: luci-ssl-nginx uwsgi

nginx configuration

    server_names_hash_bucket_size 512;
    client_header_buffer_size 32k;
    large_client_header_buffers 4 32k;
client_max_body_size 8g;

gzip on;
gzip_vary on;
gzip_proxied any;

    fastcgi_connect_timeout 300s;
    fastcgi_send_timeout 300s;
    fastcgi_read_timeout 300s;
    fastcgi_buffer_size 256k;
    fastcgi_buffers 16 256k;
    fastcgi_busy_buffers_size 512k;
    fastcgi_temp_file_write_size 512k;
            fastcgi_intercept_errors on;

root /www;

server { #see uci show 'nginx._lan'
	listen 443 ssl default_server;
	listen [::]:443 ssl default_server;
	server_name _lan;
	include restrict_locally;
	include conf.d/*.locations;
	ssl_certificate /etc/nginx/conf.d/_lan.crt;
	ssl_certificate_key /etc/nginx/conf.d/_lan.key;
	ssl_session_cache shared:SSL:32k;
	ssl_session_timeout 64m;
	access_log off; # logd openwrt;
}

server { #see uci show 'nginx._redirect2ssl'
	listen 80;
	listen [::]:80;
	server_name _redirect2ssl;
	return 302 https://$host$request_uri;
}

location /cgi-bin/luci {
		index  index.html;
		include uwsgi_params;
		uwsgi_param SERVER_ADDR $server_addr;
		uwsgi_modifier1 9;
		uwsgi_read_timeout 1800;
		uwsgi_send_timeout 300;
		proxy_read_timeout 75s;
		proxy_send_timeout 75s;
		proxy_connect_timeout 75s;
		uwsgi_socket_keepalive on;
		uwsgi_force_ranges on;
		uwsgi_connect_timeout 300s;
		uwsgi_ignore_client_abort on;
		uwsgi_next_upstream_timeout 120s;
		uwsgi_next_upstream_tries 10;
		uwsgi_max_temp_file_size 4096m;
		uwsgi_pass unix:////var/run/luci-webui.socket;
}
location ~ /cgi-bin/cgi-(backup|download|upload|exec) {
		include uwsgi_params;
		uwsgi_param SERVER_ADDR $server_addr;
		uwsgi_modifier1 9;
		uwsgi_read_timeout 1800;
		uwsgi_send_timeout 300;
		proxy_read_timeout 75;
		proxy_send_timeout 75s;
		proxy_connect_timeout 75s;
		uwsgi_socket_keepalive on;
		uwsgi_force_ranges on;
		uwsgi_connect_timeout 120s;
		uwsgi_ignore_client_abort on;
		uwsgi_next_upstream_timeout 120s;
		uwsgi_next_upstream_tries 10;
		uwsgi_max_temp_file_size 4096m;
		uwsgi_pass unix:////var/run/luci-cgi_io.socket;
}


location /luci-static {
		error_log stderr crit;
}

location /ubus {
        ubus_interpreter;
        ubus_socket_path /var/run/ubus/ubus.sock;
        ubus_parallel_req 2;
}

Please pay attention to the details. I use a stopwatch to time every 60 seconds, and it returns 504

Start with the provided nginx configuration for /cgi-bin/luci and the nginx and uwsgi log entries, then reproduce the Docker image pull that fails after 60 seconds. Compare the nginx/uwsgi path with the reported uhtpd setup. Done means identifying whether the failure is in nginx, uwsgi, or the Luci setup and documenting a confirmed configuration or reproducible bug.