2017/09/14 20:22:06 [error] 288416#288480: *1 upstream prematurely closed connection while reading response header from upstream, client: 127.0.0.1, server: localhost, request: "GET /aa.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "localhost", referrer: "http://localhost/