Display separate robots.txt if host is subdomain (one server block)-CodePudding

I have created 2 separate robot.txt files: robots.txt and disabled-robots.txt

I have one server block with alias in my nginx config. What I am trying to achieve is:

example.com/robots.txt => robots.txt
v2.example.com/robots.txt => disabled-robots.txt

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name v2.example.com example.com;

    location = /robots.txt {
       // I think I need to update here, but confused about what I should put

       // if ($host == v2.example.com) {
       //     show disabled-robots.txt
       // } else {
       //     show robots.txt
       // }
    }
}

All the examples I have found on StackOverflow shows 2 separate server blocks, however I want to keep my one server block.

CodePudding user response：

Rather than use the if inside a location (which has problems in this context), use a map with try_files instead.

For example:

map $host $which_robot {
    default         /robots.txt;
    v2.example.com  /disabled-robots.txt;
}
server {
    ...

    location = /robots.txt {
        root /path/to/directory;
        try_files $which_robot =404;
    }
}

Note that map must be declared outside the server block. See the map documentation.