我有一种情况，在重定向到外部站点之前，我需要通过内部代理服务器将请求路由到 Apache，设置是这样的：
Browser Request --> Apache --> Internal Proxy Server --> External Site
在没有代理服务器的情况下，我使用作为代理处理的重写完成了重定向（ [P] ）
RewriteRule ^/somepath/(.*) http://www.externalsite.com/$1 [P,QSA,L]
我发现在转发代理后面设置 apache，这看起来像是我想要设置的，并建议我尝试以下指令：
ProxyPass /somepath/ http://www.externalsite.com/
ProxyPassReverse /somepath/ http://www.externalsite.com/
ProxyRemote http://www.externalsite.com/ http://internal.proxy.ip.addy:8080
当我设置它时，我得到了 503 和以下 Apache 日志条目：
[Thu Apr 11 07:47:14 2013] [debug] mod_proxy_http.c(1973): proxy: HTTP: serving URL http://www.externalsite.com/somefile.html
[Thu Apr 11 07:47:14 2013] [debug] proxy_util.c(2011): proxy: HTTP: has acquired connection for (www.externalsite.com)
[Thu Apr 11 07:47:14 2013] [debug] proxy_util.c(2067): proxy: connecting http://www.externalsite.com/somefile.html to www.externalsite.com:80
[Thu Apr 11 07:47:14 2013] [debug] proxy_util.c(2193): proxy: connected http://www.externalsite.com/somefile.html to internal.proxy.ip.addy:8080
[Thu Apr 11 07:47:14 2013] [debug] proxy_util.c(2444): proxy: HTTP: fam 2 socket created to connect to www.externalsite.com
[Thu Apr 11 07:47:35 2013] [error] (OS 10060)A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. : proxy: HTTP: attempt to connect to internal.proxy.ip.addy:8080 (www.externalsite.com) failed
代理服务器日志中没有记录任何内容，如果我在浏览器中明确设置并加载该 externalsite.com，我知道代理服务器可以工作
有什么想法吗？