nginx 502 bad gateway

fastcgi_send_timeout 180;
fastcgi_read_timeout 180;
fastcgi_buffer_size 128k;
fastcgi_buffers 4 256k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;

proxy_set_header Host $host:$server_port;

参考地址：https://www.cnblogs.com/kevingrace/p/6093671.html