Nginx 中用map 语句来判断某个header field是否存在

如果一个header field不存在,那么他的值为””. 这种方式仅在header中出现.

所以我们可以用下面的方式来判断某个header field是否存在.

map $http_cf_connecting_ip $client_ip_from_cf {
default $http_cf_connecting_ip;
"" $remote_addr;
}

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