Nginx 502 Bad Gateway error ONLY in Firefox

Question

I am running a website locally, all the traffic is routed through NGinx which then dispatches requests to PHP pages to Apache and serves static files. Works perfectly in Chrome

Answer 1

open /etc/nginx/nginx.conf and add the following lines into http section :

fastcgi_buffers 8 16k;
fastcgi_buffer_size 32k;

This fix worked for me in a CI web application. read more at http://www.adminsehow.com/2012/01/fix-nginx-502-bad-gateway-error/