Increase default buffer sizes

nginx.conf

@@ -32,6 +32,11 @@ http {
 	# Limits & Timeouts
 	include global/limits.conf;
 
+    # Some WP plugins that push large amounts of data via cookies
+    # can cause 500 HTTP erros if these values aren't increased.
+    fastcgi_buffers 16 16k;
+    fastcgi_buffer_size 32k;
+
 	# Default Logs
 	error_log /var/log/nginx/error.log warn;
 	access_log /var/log/nginx/access.log;