How to redirect NGINX - php

Question

I'm trying to redirect from
https://support.example.com.br/
for
https://support.example.com.br/?SSO=1
how do i do this through nginx?
my code is like this:
server {
listen 8080;
index index.php index.html;
error_log /var/log/nginx/error.log;
access_log /var/log/nginx/access.log;
location / {
rewrite ^/$ /?SSO=1$1 redirect;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass php:9000;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param SERVER_NAME $host;
}
location ~ /\.ht {
deny all;
}
location ~ php-errors\.log$ {
deny all;
}
}

Answer 1

server {
...
rewrite ^/$ /?SSO=1 permanent;
}

Answer 2

Please, do not ask second, third and so on questions about the same problem. Use the comments system to clarify your problems with the particular answer. To prevent a redirect when the SSO query argument already specified in request, try this:
server {
... # global server block directives
if ($arg_SSO = '') {
rewrite ^/$ /?SSO=1 permanent;
}
... # your locations goes here
}