import var [as name] [from "path"]
VOID set(STRING key, STRING value)
STRING get(STRING)
VOID global_set(STRING, STRING)
STRING global_get(STRING)
VOID set_int(STRING key, INT value)
INT get_int(STRING key)
VOID set_string(STRING key, STRING value)
STRING get_string(STRING key)
VOID set_real(STRING key, REAL value)
REAL get_real(STRING key)
VOID set_duration(STRING key, DURATION value)
DURATION get_duration(STRING key)
VOID set_ip(STRING key, IP value)
IP get_ip(STRING key)
VOID set_backend(STRING key, BACKEND value)
BACKEND get_backend(STRING key)
VOID clear()

vcl 4.0;
import var;
backend default { .host = "192.0.2.11"; .port = "8080"; }
sub vcl_recv {


    # Set and get some values.


    var.set("foo", "bar");


    set req.http.x-foo = var.get("foo");


    var.set_int("ten", 10);


    var.set_int("five", 5);


    set req.http.twenty = var.get_int("ten") + var.get_int("five") + 5;


    # VCL will use the first token to decide final data type. Headers are strings.


    # set req.http.X-lifetime = var.get_int("ten") + " seconds"; #  Won't work.


    set req.http.X-lifetime = "" + var.get_int("ten") + " seconds";  # Works!


    var.set_duration("timedelta", 1m);  # 60s


    set req.http.d1 = var.get_duration("timedelta");


    var.set_ip("endpoint", client.ip);


    set req.http.x-client = var.get_ip("endpoint");


    # Unset all non-global variables.


    var.clear();


    # Demonstrate use of global variables as state flags.


    if (req.url ~ "/close$") {


        var.global_set("open", "no");


    }


    else if (req.url ~ "/open$") {


        var.global_set("open", "yes");


    }


    if (var.global_get("open") != "yes") {


        return (synth(200, "We are currently closed, sorry!"));


    }
}