Upstream sent too big header while reading response headers from upstream solution 520 Bad Gateway

Key configuration

Proxy_buffer_size 64k;
Proxy_buffers 32k;

Proxy_busy_buffers_size 128k;

The placement reference is as follows

#user nobody;

Worker_processes 1;
#error_log Logs/error.log;
#error_log Logs/error.log Notice;

#error_log Logs/error.log Info;


#pid Logs/nginx.pid;


Events {worker_connections 1024;}
    HTTP {include mime.types;

    Default_type Application/octet-stream; #log_format Main ' $remote _addr-$remote _user [$time _local] "$request" ' # ' $status $body _bytes_sen

    T "$http _referer" ' # ' "$http _user_agent" "$http _x_forwarded_for";

    #access_log Logs/access.log Main;
    Sendfile on;

    #tcp_nopush on;
    #keepalive_timeout 0;

    Keepalive_timeout 65;
	#gzip on;
	# 502 Bad Gateway Error Resolution configuration start proxy_buffer_size 64k;
	Proxy_buffers 32k;
	Proxy_busy_buffers_size 128k;
        # 502 Bad Gateway Error Resolution configuration End server {Listen 80;

        server_name yun.yyhvr.cn;

        #charset Koi8-r;

        #access_log Logs/host.access.log Main; Location/{root/oPt/yyh/font/yyh_web;
			
		Index index.html;
		# 502 Bad Gateway Error Resolution configuration start proxy_buffer_size 64k;
		Proxy_buffers 32k;
		Proxy_busy_buffers_size 128k;
        # 502 Bad Gateway Error resolution configuration end client_max_body_size 100m;
			} location/rest/{Proxy_pass http://localhost:8004;
		Client_max_body_size 100m;
        } error_page 502 503 504/50x.html;
        Location =/50x.html {root html;
 }

         
    }


     

}