NGINX Rewrite Query as Path?

Question

What i am trying to do:

Convert

/posts/?post={randomnumber-atoF}
or
/posts?post=120430awasdfwasfw

to

/posts/120430awasdfwasfw

my Server Block (so far)

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        root /forum;
        index index.php;
        server_name forum.example.net;
        location / {
                try_files $uri $uri/ =404;
        }
        # pass PHP scripts to FastCGI server
        #
        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
                fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        }
        location ~ /\.ht {
                deny all;
        }
}

The server is getting the URL passed from another Nginx Proxy (another remote server). (and this server does have SSL, port 443)

Items i have tried:

rewrite ^/posts/index.php /posts/$arg_post permanent;

edit:

sorry i didnt say, the query most go into the Index, as the ?post is a query, into a database. I want to make it so you dont need the query, but just go to the {post number}

Answer 1

The title of the post could be "convert / rewrite URL path to query". Anyway, as per the edit and the comments, rewrite ^/posts/(?<id>[a-zA-Z0-9]+)$ /posts/?post=$id; may work. No need to use permanent flag for rewrite. If you use permanent, the user will be redirected.

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        root /forum;
        index index.php;
        server_name forum.example.net;

        rewrite ^/posts/(?<id>[a-zA-Z0-9]+)$ /posts/?post=$id;

        location / {
                try_files $uri $uri/ =404;
        }
        # pass PHP scripts to FastCGI server
        #
        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
                fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        }
        location ~ /\.ht {
                deny all;
        }
}