IP-based HTTP auth

[Shamsundar Dileep]

Hello, I'm trying to implement HTTP auth, but want to limit it by IP.
That is, users originating from our office IP should not have to enter a
password, but everyone else should. I tried the following but with no
luck:

limit_except GET {
  allow 192.1.1.1;
  auth_basic            "Restricted";
  auth_basic_user_file  /usr/local/nginx/conf/htpasswd;
  deny all;
}

Auth does not work in the scope of if, what else can I do? Thanks.
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