Nginx - Primary script unknown while reading response header from upstream - nginx

Question

Recently we have migrated from Apache2 to Nginx server. Consider we have domain www.test.com and following is the www.test.com.conf and I had disabled default Nginx default file.
server {
server_name www.test.com;
# Character Set
charset utf-8;
# Logs
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
# Directory Indexes
index index.html index.htm index.php;
# Document Root
root /var/www/html/project1/public;
# Location
location / {
try_files $uri $uri/ /index.php$is_args$args;
}
# Error Pages
error_page 404 /404.html;
error_page 500 502 503 504 /50x.html;
# PHP-FPM Support
location ~ \.php$ {
fastcgi_read_timeout 240;
fastcgi_pass unix:/var/run/php/php7.2-fpm.sock; #/var/run/php5-fpm.sock;
#include fastcgi.conf;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
# Block access to .htaccess
location ~ \.htaccess {
deny all;
}
client_body_timeout 10s;
client_header_timeout 10s;
client_max_body_size 100M;
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/www.test.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/www.test.com/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = www.test.com) {
return 301 https://$host$request_uri;
} # managed by Certbot
listen *:80;
server_name www.test.com;
return 404; # managed by Certbot
}
With the above configuration, I can access https://www.test.com without issues. In this case root /var/www/html/project1/public. Now to access multiple applications from the same domain I had changed the root directive to /var/www/html/ and tried to access https://www.test.com/project1/public but I'm getting the following error
FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream
May I know the reason for this issue? my application is Lumen which is a mirco service framework by Laravel.

Answer 1

By changing the following blocks it is working for me
from root /var/www/html/project1/public; to root /var/www/html;
And we need to add multiple location blocks based on the requirement. Consider I want to access two Lumen/ Laravel applications from single domain, then I need to add two location blocks as
location /project1/public {
try_files $uri $uri/ /project1/public/index.php$is_args$args;
}
location /project2/public {
try_files $uri $uri/ /project2/public/index.php$is_args$args;
}
Credits go to Richard Smith