linux - nginx default page cannot be opened

Question

I installed apache and nginx at the same time and only opened nginx. When I entered localhost in the browser, the apache page was displayed. Why? I have not touched any configuration of nginx. Why is the nginx page not displayed? Also, I turned off nginx and entered localhost to try again. This page still opened. Why is it not 404 at this time?

The following are all the configurations of nginx.conf

user www-data;
worker_processes auto;
pid /run/nginx.pid;

events {
worker_connections 768;
# multi_accept on;
}

http {

##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;

##
# SSL Settings
##

ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

##
# Logging Settings
##

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

##
# Gzip Settings
##

gzip on;
gzip_disable "msie6";

# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

##
# Virtual Host Configs
##

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}


#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
# 
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
# 
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;
# }
# 
# server {
# listen localhost:143;
# protocol imap;
# proxy on;
# }
#}

Answer 1

Maybe the root under your nginx configuration points to this file. Judging from the output of your netstat, nginx has been started successfully, otherwise it will prompt that 80 is occupied by apache.

Answer 2

Query the f12 response header of the web page to see if it is the nginx response or the apache response. From your description, nginx has no effect from the beginning to the end, it is all the requested apache