Nginx未知指令"if($ http_user_agent"

Question

当用户代理标头具有特定值时,我尝试返回503状态代码.我尝试了外部和内部的位置块.但是,当我重新加载此配置nginx failes重新加载:

upstream api{
    server 127.0.0.1:1336;
}

# the nginx server instance
server {
    listen 0.0.0.0:80;
    server_name api.project.com;

   # if($http_user_agent = "android") {
   #     return 503;
   # }

    # pass the request to the node.js server with the correct headers
    location / {

     # if($http_user_agent = "android") {
     #   return 503;
     # }

      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;

      proxy_pass http://api/;
      proxy_redirect off;
    }
}

任何想法都错了吗？我使用的是nginx/1.4.7

来自syslog:

nginx: [emerg] unknown directive "if($http_user_agent"

Answer 1

在if和(.之间添加一个空格应该可以做到!