nginx多级目录反代

最近想把轻量服务丢在netcup 0.84EUR上整个All in one，也懒得域名解析那么多了。但单域名就会有个问题：指定多级目录的情况下，如果/abc的网页服务请求/js目录会报错，因为其请求的/js目录不应该是域名下的/js，而应该是请求/abc/js目录。

但在网络上搜到的都是直接硬rewrite，而我有多个多级目录，不可能这么做，所以就缝合了一个想法：

1. 先是和gpt对线，他给了一个给每个/abc目录产生的请求赋予/abc header的想法，认为能自动处理，实际不行；
2. 然后我去网上搜，发现了有通过if判断请求文件名来转发的方式
3. 产生了把上述方式合二为一的想法，即给每个/abc目录的请求赋予/abc header，然后通过判断/abc header进行转发
4. 测试下来思路可行

具体nginx demo配置如下(demo的二级目录为smokeping)：

location / {
    # your main conf...
    # judge header
    if ($http_referer ~ /smokeping) {
        # If the SmokePing header is set, rewrite accordingly
        # Only rewrite css/js/cache path. You can structure your own configuration file based on your own needs.
        rewrite ^/(css|js|cache)/(.*)$ /smokeping/$1/$2 last;
    }
}
location /smokeping {
    # This block is for requests specifically targeting /smokeping
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    # Adding header
    proxy_set_header Referer /smokeping;

    proxy_pass http://127.0.0.1:9008/;
}

如果是三级目录，则如下：

location / {
    # Your own conf
}
location /smokeping {
    if ($http_referer ~ "/smokeping/cc") {
        # If the SmokePing header is set, rewrite accordingly
        # Only rewrite css/js/cache path. You can structure your own configuration file based on your own needs.
        rewrite ^/smokeping/(css|js|cache)/(.*)$ /smokeping/cc/$1/$2 last;
    }

    if ($http_referer ~ "/smokeping/netcup") {
        # If the SmokePing header is set, rewrite accordingly
        # Only rewrite css/js/cache path. You can structure your own configuration file based on your own needs.
        rewrite ^/smokeping/(css|js|cache)/(.*)$ /smokeping/netcup/$1/$2 last;
    }
    location /smokeping/cc {
        # This block is for requests specifically targeting /smokeping/cc
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        # Adding header
        proxy_set_header Referer /smokeping/cc;

        proxy_pass http://0.0.0.0:9008/;
    }
    location /smokeping/netcup {
        # This block is for requests specifically targeting /smokeping/netcup
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        # Adding header
        proxy_set_header Referer /smokeping/netcup;

        proxy_pass http://0.0.0.0:49131/;
    }
}

如果懒得判断需要转发哪些目录，想全部转发，则把rewrite部分改为以下即可(作为参考，根据自己需求修改)：

rewrite ^/(.*)$ /smokeping/$1 last;

未进行效率测试，但就我个人角度而言，私以为额外处理并检查请求中的 Referer 头这种微小的性能损失相比于使用 Nginx 来处理资源路径重写所提供的便利性而言是可以接受的

总结

nginx转发配置本身不变，只是在每个对应目录下添加对应的Referer头，再在上一级的配置中进行对Referer头的判断并进行rewrite。