500 Error /api/v2/system/environment

I know this a old but I ran into this error when using Nginx

Make sure you edit your nginx.conf snginx.conf files according to
http://wiki.dreamfactory.com/DreamFactory/Installation/Linux/Apt

server {
    listen 80 default_server;
    listen [::]:80 default_server ipv6only=on;

    root /path/to/dreamfactory/public;
    index index.php index.html index.htm;

    server_name server_domain_name_or_IP;
   
    gzip on;
    gzip_disable "msie6";
   
    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; 

    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

For php 7.0
replace with
fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;