The wordpress is been built on nginx ,the port is 8080 ,it can be visited at the form of
http://127.0.0.1:8080/wp/?p=4.

In my wordpress database:

select guid  from wp_posts limit 2 ;
+-------------------------------+
| guid                          |
+-------------------------------+
| http://127.0.0.1:8080/wp/?p=4 |
| http://127.0.0.1:8080/wp/?p=8 |
+-------------------------------+

Now i want to change the port of nginx from 8080 into 80.

1.edit /etc/nginx/nginx.conf
from

server {
    listen 8080;
    server_name localhost;

#irrelated  content omitted 

into

server {
    listen 80;
    server_name localhost;

2.edit /var/www/html/wp/wp-config.php

from

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

into

define('WP_SITEURL','http://localhost:80/wp/');
define('WP_HOME','http://localhost:80/wp/');

3.login into my wordpress database to execute the sql commands.

UPDATE wp_posts SET post_content = replace(post_content, 'http://127.0.0.1:8080/wp', 'http://127.0.0.1/wp'); 
UPDATE wp_options SET option_value = replace(option_value, 'http://127.0.0.1:8080/wp', 'http://127.0.0.1/wp'); 
UPDATE wp_posts SET guid = replace(guid, 'http://127.0.0.1:8080/wp', 'http://127.0.0.1/wp'); 
UPDATE wp_posts SET pinged = replace(pinged, 'http://127.0.0.1:8080/wp', 'http://127.0.0.1/wp'); 
update wp_options set option_value='http://localhost:80' where option_name='siteurl';
update wp_options set option_value='http://localhost:80' where option_name='home';

Now restart ngix.

service nginx restart

when i input http://127.0.0.1:80/wp/?p=4 in the browser.
http://i.stack.imgur.com/buZrc.png

Where the problem appear？