Upstream sent too big header while response header
How to fix the upstream sent too big header while reading response header from upstream error.
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The error will appear in Nginx error logs as:
* upstream sent too big header while reading response header from upstream, client: 10.20.30.40, server: localhost.example,
Update buffer sizes
Edit the
nginx.conf
file to update the buffer sizes:
server {
fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
}