why can't change nginx port from 8080 into 80?

1.mysql
In my wordpress the guid is the form of https://127.0.0.1/wp/?p=1931 .

select guid  from wp_posts limit 1 ;
+--------------------------+
| guid                     |
+--------------------------+
| https://127.0.0.1/wp/?p=4 |
+--------------------------+

2.wordpress

cat   /var/www/html/wp/wp-config.php
define('WP_SITEURL','https://localhost:8080/wp/');
define('WP_HOME','https://localhost:8080/wp/');

3.nginx

cat  /etc/nginx/nginx.conf
server {
    listen 8080;
    server_name localhost;
    index index.html index.htm index.php;
    root /var/www/html;
location / {
        try_files $uri $uri/ /index.html;
    }

    error_page 404 /404.html;

    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}

My wordpress can be visited to input url in the form of https://127.0.0.1:8080/wp/ or https://127.0.0.1:8080/wp/?p=1938. Now i want to change the port from 8080 into 80.

1.to edit /var/www/html/wp/wp-config.php

from

define('WP_SITEURL','https://localhost:8080/wp/');
define('WP_HOME','https://localhost:8080/wp/');

into

define('WP_SITEURL','https://localhost/wp/');
define('WP_HOME','https://localhost/wp/');

2.to edit /etc/nginx/nginx.conf

from

server {
    listen 8080;

into

server {
    listen 80;

restart nginx.

The wordpress can’t be visited When to input https://127.0.0.1/wp/ in chrome.

If i delete the two lines in the /var/www/html/wp/wp-config.php.

define('WP_SITEURL','https://localhost/wp/');
define('WP_HOME','https://localhost/wp/');

The url will jump to https://127.0.0.1:8080/wp/ when to input https://127.0.0.1/wp/ in chrome.