我有一个服务器应用程序作为休息服务器，它只从一个客户端应用程序接收数据。我在我的nginx日志中看到了这个错误：
2015/10/27 04:34:33 [error] 12383#0: *69 FastCGI sent in stderr: "PHP message: PHP Warning: Missing boundary in multipart/form-data POST data in Unknown on line 0" while reading response header from upstream, client: yy.yy.yy.yy, server: xyz, request: "POST /availability/check_availability HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "xx.xx.xx.xx"
这是什么意思，我怎么能摆脱它？