If you’re getting the following error in your nginx logs:
[error] 12345#0: upstream sent too big header while reading response header from upstream,
You need to increase the buffers for that specific location inside nginx configuration:
server {
listen 80;
server_name example.com;
location / {
proxy_pass http://someUpstream;
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
}
}