error_page 404 /404.html;
location = /40x.html {
}

error_page 500 502 503 504  /50x.html;
location = /50x.html {
}

location /error {
    root  html;
    ry_files $uri    /502.html;
}
#当访问到不存在的页面时，将跳转到/502.html页面，此时浏览器地址栏 URL 没变化，但是状态码不再是 502，而是200

location /error {
    root  html;
    error_page 502  /502.html;
}

location /error {
    root  html;
    error_page 502  https://blog.kjarbo.com/error;
}

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

error_page 502 503 =200 /50x.html;
location = /50x.html {
    root /usr/share/nginx/html;
} 
#访问产生 502 、503 的时候给用户的返回状态是200，内容是50x.html

error_page 500 502 503 504 @maintenance;
location @maintenance {    
    proxy_pass http://backend;

error_page 404 = /404.php;
location ~ \.php$ {
    fastcgi_pass 127.0.0.1:9000;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
}  

location /error {
    root  html;
    error_page 502 = /502.html;
}
#由于这里 /502.html 页面是存在的，状态码是 200

server {
    listen      80;
    server_name blog.kjarbo.com;

    location / {
        proxy_pass http://10.10.10.10:80;
        error_page 502 =200 @maintenance;
    }

    location @maintenance {
        root /usr/local/nginx/html/error;
        try_files $uri /502.html =503;
    }
}

location ~ .*\.(js|css)$ {
    root  /usr/local/nginx/html/static;
}

location ~ ^/(\.user.ini|\.htaccess|\.git|\.svn|\.project|LICENSE|README.md)
{
    return 404;
}