局域网内一台服务器装了论坛，然后用另一台上的apache做了反向代理指向论坛服务器，访问的时候有时候正常，有时候会报如下错误：
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /bbsboa.php.

Reason: Error reading from remote server



PS：apache用的最新版本的，KeepAlive也已经off了，google了好久也没古狗到一个答案
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