502错误 Nginx日志 upstream sent too big header while reading response header from upstream

2020/11/06 13:05:08 [error] 105478#0: *104739 upstream sent too big header while reading response header from upstream, client: 10.20.90.26, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.136.16:8088"
2020/11/06 13:05:08 [error] 105478#0: *104739 upstream sent too big header while reading response header from upstream, client: 10.20.90.26, server: localhost, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.136.16:8088", referrer: "http://192.168.16.16:8088/"

# vim conf/nginx.conf
# sbin/nginx -s reload

http {

    proxy_buffer_size  128k;
    proxy_buffers   32 256k;
    proxy_busy_buffers_size 256k;
    fastcgi_buffers 16 16k;
    fastcgi_buffer_size 32k;

    server {

    }
}