Nginx different root for only mainpage - laravel

Question

I am trying to configure nginx to set two roots for one domain. My folder structure looks like:
/var/www/
mainpage/
project/index.php
backend/
public/index.php
I need to have root url example.com uses project in folder mainpage and all other urls uses project in folder backend (this is laravel app).
I have started to try to access mainpage project by url example.com/mainpage, but I'm receiving 403 or "Input file not specified". My nginx config:
server {
server_name example.com;
root "/var/www/backend/public";
index index.html index.htm index.php;
charset utf-8;
location /mainpage/ {
alias /var/www/mainpage/project;
try_files $uri $uri/ /index.php$is_args$args;
}
location / {
try_files $uri $uri/ /index.php?$query_string;
}
access_log off;
sendfile off;
client_max_body_size 100m;
location ~ \.php$ {
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/run/php/php7.2-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_intercept_errors off;
fastcgi_buffer_size 16k;
fastcgi_buffers 4 16k;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
}
location ~ /\.ht {
deny all;
}
This config return "403 forbidden". How should I configure nginx to work properly? And how to configure it to access mainpage for "/" url and other urls to use backend project

Answer 1

You can set up root directory inside each location e.g.:
location / {
try_files $uri $uri/ /index.php?$query_string;
root /your/root/directory;
}