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I need not to serve robots.txt for any subdomain. For example, should be available, but should return 404.

I've tried it like so, but it didn't work:

set $subdomain FALSE;
if ($host ~* "^(([a-z0-9_\-]+)\.domain\.com)$") {
    set $subdomain TRUE;

location ~ "robots.txt$"{
    if ($subdomain = TRUE){
        return 404;
share|improve this question
up vote 1 down vote accepted
location ~ /robots.txt
       if ($host != '') {
       return 404;
share|improve this answer
This works, but why did someone downvote this answer? – Rakhim Davletkaliyev Jul 30 '13 at 15:25

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