Map指令内的变量插值 [英] Variable interpolation inside Map directive

问题描述

我正在尝试在Nginx的http指令内映射一个变量.

I am trying to map a variable inside the http directive in Nginx.

当单独放置时，变量将单独扩展，如果我在字符串中添加其他内容，扩展将停止工作.

When left alone, the variable alone gets expanded, if I add anything else to the string the expansion stops working.

http {

    map $host $foo {
        #default "$host";                    # - this works fine and returns 'localhost' 
        default "This is my host: $host";    # - THIS DOESN'T WORK
    }

    server {

        location / {
            echo $foo;
        }

    }

}

您对在地图内部进行扩展有什么建议吗?

Do you have any suggestions to make the expansion work inside the map?

推荐答案

如map指令文档:

结果值可以是字符串或其他变量(0.9.0).

The resulting value can be a string or another variable (0.9.0).

更新:此功能已添加到NGinx的1.11.2版本中，如此处的注释7:

Update: This functionality has been added to version 1.11.2 of NGinx, as per Comment #7 here: https://trac.nginx.org/nginx/ticket/663#comment:7

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