Apache 502 The proxy server 解决办法

Apache 使用代理出现
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /.

Reason: DNS lookup failure for: xxx.xxx.com
错误，解决办法：

在apache配置文件中的httpd.conf或vhost目录中添加

SetEnv force-proxy-request-1.0.1
SetEnv proxy-nokeepalive 1    （加到外面使用与所有主机）

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