Nginx implementation of If multiple-judgment configuration Method Example _nginx

The Nginx configuration does not support the logic and/or operation of the IF condition, and does not support the nested syntax of if, we can implement it in a variable way:
The first is pseudocode (that is, not supported by Nginx), written here only for ease of understanding:

Copy Code code as follows:

if ($remote _addr ~ "^ (12.34|56.78)" && $http _user_agent ~* "Spider") {
return 403;
}

Below this is equivalent and the actual available configuration

Copy Code code as follows:

Set $flag 0;
if ($remote _addr ~ "^ (12.34|56.78)") {
Set $flag "${flag}1";
}
if ($http _user_agent ~* "Spider") {
Set $flag "${flag}2";
}
if ($flag = "012") {
return 403;
}