关于NGINX变量的一些测试结果

作为NGINX变量，不像正规语言那么正式。

但处理自定义和内部变量时，这些操作，也是少不了的。

geo $dollar {
        default "$";
    }
    server {
        listen ;
        location /test {
            set $foo chengang;
            set $first "hello ";
            echo "${first}world";
            echo "foo: $foo";
            echo "this is a dollar sign:$dollar";
            }
        location /bad {
            set $bar "nginx";
            echo $bar;
        }
        location /foo {
            set $a hello;
            echo "$foot = [$foot]";
            echo_exec /bar;
        }
        location /bar {
            set $foot ;
            echo "foot = [$foot]";
            echo "a = [$a]";
        }
    }

server {
        listen ;
        location /test {
            echo "uri =  $uri";
            echo "request_uri = $request_uri";
            echo "name: $arg_name";
            echo "class: $arg_class";
            set $orig_args $args;
            set $args "a=3&b=4";
            echo "original args: $orig_args";
            echo "args: $args";
        }
    }

server {
        listen ;
        location /test {
            set $args "foo=1&bar=2";
            proxy_pass http://127.0.0.1:8081/args;
        }
    }
    server {
        listen ;
        location /args {
            echo "args: $args";
        }
    }