Form submission 502 in nginx reverse proxy

Nginx Parameter Adjustment

Nginx. conf

Server_names_hash_bucket_size 256;

Client_header_buffer_size 256 K;

Large_client_header_buffers 4 256 K;

Client_max_body_size 50 m;

Sendfile on;

Tcp_nopush on;

Keepalive_timeout 200;

Tcp_nodelay on;

Client_body_buffer_size 256 K;

Client_header_timeout 3 m;

Client_body_timeout 3 m;

Send_timeout 3 m;

Server_tokens off;

Fastcgi_connect_timeout 300;

Fastcgi_send_timeout 300;

Fastcgi_read_timeout 300;

Fastcgi_buffer_size 128 K;

Fastcgi_buffers' 4 128 K;

Fastcgi_busy_buffers_size 256 K;

Fastcgi_temp_file_write_size 256 K;

Proxy_connect_timeout 300;

Proxy_read_timeout 300;

Proxy_send_timeouts 300;

Proxy_buffer_size 128 K;

Proxy_buffers 4 128 K;

Proxy_busy_buffers_size 256 K;

Proxy_temp_file_write_size 256 K;

Vhost

Client_max_body_size 40 m;

Client_body_buffer_size 256 K;

Proxy_connect_timeout 900;

Proxy_send_timeouts 900;

Proxy_read_timeout 900;

Proxy_buffer_size 256 K;

Proxy_buffers 4 256 K;

Proxy_busy_buffers_size 256 K;

Proxy_temp_file_write_size 256 K;

Form submission 502 in nginx reverse proxy