how can I use AND operator in IF statement in nginx?

Question

I'm trying to cache the request based on the response header. Right now my desire condition is if the response has both 2 headers client-device and client-location, then the response should be cached on nginx side

So I tried with this code

if ($http_client_device && $http_clocation) {
    set $cache_key "$request_uri$http_client_device$http_client_location";
}
proxy_cache_key $cache_key;

but nginx doesn't allow that nginx: [emerg] unexpected "&&" in condition in...

anyway to work around for this one? thanks in advance

Answer 1

After searching around the whole day, I reach a work around way, reference to this topic http://rosslawley.co.uk/archive/old/2010/01/04/nginx-how-to-multiple-if-statements/

So in general my code will look like this:

    if ($http_client_device) {
        set $temp_cache 1;
    }
    if ($http_client_location) {
        set $temp_cache 1$temp_cache;
    }
    if ($temp_cache = 11) {
        set $cache_key ...; 
    }

but still wonder is there any cleaner way to do AND operator in nginx