nginx设置重定向跳转后  ip:[端口]/abc  变成  ip/abc  而报错404

nginx配置：

    server {
        listen    80;
        server_name  _;
        client_max_body_size 300m;
        absolute_redirect off;


        location / {
            root     html;
            index  index.html index.htm;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
        }

    ## abc目录
        location /abc/ {
        if (-d $request_filename) {
           rewrite [^/]$ $scheme://$http_host$uri/ permanent;
        }
            proxy_pass http://localhost:8088/; 
            ##由于规定了流量出口必须是80，所以得在80的server上代理出8088端口的abc项目
            proxy_set_header Host $host:$server_port;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header REMOTE-HOST $remote_addr;
            proxy_http_version 1.1;
        proxy_read_timeout   3600s;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
            add_header X-Cache $upstream_cache_status;
        add_header Cache-Control no-cache;

        }

 

server {
        listen       8088;
        server_name  _;
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Headers X-Requested-With;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
        charset utf-8;
        location / {
            root /opt/abc/;
            index  index.html index.htm;
            autoindex_exact_size off;
            autoindex_localtime on;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host:$server_port;

        }
        }

本地测试项目是否能正常访问：

http://192.168.1.22:8088 正常访问

http://192.168.1.22/abc 正常访问

当我需要将192.168.1.22:8088映射到外网ip:[port] 进行外网访问时报错。

假设外网ip=122.23.43.21

路由分配：122.23.43.21:5566  指向内网  --> 192.168.1.22:8088

也就是说，当我访问 122.23.43.21:5566/abc 时 可访问http://192.168.1.22:8088 项目

但是当我使用外网地址访问项目时：

http://122.23.43.21:5566/abc/    项目正常访问

http://122.23.43.21:5566/abc 项目由 

http://122.23.43.21:5566/abc   重定向为 http://122.23.43.21/abc/   而导致报错404

也就是说在nginx.conf里，nginx把所有的ip:[port]都会自动跳转成ip:80 也就是默认重定向后是80端口，而外网ip的80端口是没有作映射的，所以404

此时我们需要知道，重定向错误，必定出在nginx上。所以需要从server里下手

在反向代理中添加 absolute_redirect off; 

 server {
        listen       8088;
        server_name  _;
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Headers X-Requested-With;
        add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
        charset utf-8;
        location / {
            root /home/web/zhuhai-forest-resources-management/;
        index  index.html index.htm;
            autoindex off; ##防止ip:[port]/test 重定向请求后变成 ip/test而导致404
            autoindex_exact_size off;
            autoindex_localtime on;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host:$server_port;

        }
        }

即可成功访问

参考如下文章：

nginx重定向导致端口消失无法正常访问

场景

访问路径带端口http://ip:端口/login，回车后端口消失http://ip/login无法正常访问

解决方法

nginx配置中中加一句：

新版本nginx（≥1.11.8）

absolute_redirect off;

旧版本nginx（＜1.11.8）

port_in_redirect off;

番外：

1. 关于nginx自动跳转

站点目录结构：

根目录：/var/wwwroot/test/

当访问地址为 http://www.test.com/abc 时，因为nginx未找到abc这个文件，而是找到了abc目录，自动在地址后面加上了斜杠，所以自动发生 301 跳转到 http://www.test.com/abc/

2. nginx自动跳转相关的3个配置

Nginx中存在一三个跳转的相关配置：

1. absolute_redirect

Syntax:	absolute_redirect on | off;Default:	absolute_redirect on;Context:	http, server, locationThis directive appeared in version 1.11.8.If disabled, redirects issued by nginx will be relative.See also server_name_in_redirect and port_in_redirect directives.

默认为开启。

2. server_name_in_redirect

Syntax:	server_name_in_redirect on | off;Default:	server_name_in_redirect off;Context:	http, server, locationEnables or disables the useof the primary server name, specified by the server_name directive, in absolute redirects issued by nginx. When the useof the primary server name is disabled, the name from the “Host” request header field is used. If this field isnotpresent, the IP addressof the server is used.The use of a port in redirects is controlled by the port_in_redirect directive.

默认关闭

3. port_in_redirect

Syntax:	port_in_redirect on | off;Default:	port_in_redirect on;Context:	http, server, locationEnables or disables specifying the port in absolute redirects issued by nginx.The use of the primary server name in redirects is controlled by the server_name_in_redirect directive.

默认开启。

3. 举例

访问地址为：http://192.168.1.232/abc

Nginx情况一：

server {    listen 80;    server_name test.com;    absolute_redirect off; // 关闭了它，不管 server_name_in_redirect, port_in_redirect 怎么设置都没有用    server_name_in_redirect on;    port_in_redirect on;}

发生 301 跳转，跳转后的地址为：http://192.168.1.232/abc/

官方说是使用 请求头中的 Host 字段，作为url跳转后host部分

Nginx情况二：

server {    listen 80;    server_name test.com;    absolute_redirect on; // 默认为on, Nginx配置中没有这个字段其实值是on， server_name_in_redirect, port_in_redirect 会根据配置起作用    server_name_in_redirect on; // 发生跳转时使用 server 中配置的域名    port_in_redirect on; // 发生跳转时使用 server 中配置的端口}

发生 301 跳转，跳转后的地址为：http://test.com/abc/