Nginx overwrites general symfony errors with 502 Bad Gateway

symfony nginx

Increase your buffer size in nginx configuration and restart nginx afterwards as suggested here.

proxy_buffer_size 128k;proxy_buffers 4 256k;proxy_busy_buffers_size 256k;

Further increase the fastcgi buffer in the php section of your configuration ( location ~ .php$ )

fastcgi_buffer_size 128k;fastcgi_buffers 4 256k;fastcgi_busy_buffers_size 256k;

Referenced answer to a question from a CodeIgniter user here.

symfony nginx

You may also try to disable ChromePHP at app/config/config_dev.yml

Just comment out these lines:

chromephp:    type:   chromephp    level:  info

This plugin generates a large header and forces nginx to response with 502 Bad Gateway.

More info at:

CodeHunter