How to achieve concurrency using NGINX - nginx

Question

I made webpage using R(shiny) and deployed it on shiny-server. And tried to use NGINX to achieve multi-threaded sort of stuff. I found on some posts that NGINX can also help to achieve concurrency but I don't know how to do it. Could you please help me to do that.
In case I misunderstand the definition of concurrency, my desired result is that when different users accessed to the webpage and use some function at the same time, they don't need to wait in the queue and my server could handle those requests at the same time.
Below is the configuration:
`
user www-data;
worker_processes 4;
worker_rlimit_nofile 20960;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
use epoll;
worker_connections 1024;
accept_mutex on;
accept_mutex_delay 500ms;
multi_accept on;
}
http {
underscores_in_headers on;
aio threads;
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
upstream shiny-server {
ip_hash;
server 127.0.0.1:3838;
}
map $http_app_version $app1_url {
"1.0" http://35.78.39.174:3838;
}
server {
aio threads;
listen 80;
listen [::]:80;
server_name 35.78.39.174:3838;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
if ($http_user_agent !~* "MicroMessenger"){
set $app1_url http://35.78.39.174:3838;
}
aio threads;
proxy_pass http://localhost:3838;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Real_IP $remote_addr;
proxy_set_header User-Agent $http_user_agent;
proxy_set_header Accept-Encoding '';
proxy_buffering off;
}
location ^~ /mathjax/ {
alias /usr/share/mathjax2/;
}
}
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*.*;
server_names_hash_bucket_size 128;
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
}
I have also edited the shiny-server configuration:
# Instruct Shiny Server to run applications as the user "shiny"
run_as shiny;
sanitize_errors false;
preserve_logs true;
# Define a server that listens on port 3838
server {
listen 3838;
# Define a location at the base URL
location / {
# Host the directory of Shiny Apps stored in this directory
site_dir /home/rstudio/;
# Log all Shiny output to files in this directory
log_dir /var/log/shiny-server/port_3838;
# When a user visits the base URL rather than a particular application,
# an index of the applications available in this directory will be shown.
directory_index on;
app_init_timeout 1800;
app_idle_timeout 1800;
}
}
`
Really appreciate your help. Thanks a lot.
In case I misunderstand the definition of concurrency, my desired result is that when different users accessed to the webpage and use some function at the same time, they don't need to wait in the queue and my server could handle those requests at the same time.
Could you please how to set the configuration to achieve that?