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サーバへのリクエストをProxyPassでS3に流すときに502エラー

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WebサーバにきたリクエストをS3に流そうとおもって設定をかけたところ

ProxyPass /hoge http://xxxxxx.s3-ap-northeast-1.amazonaws.com/hoge
ProxyPassReverse /hoge http://xxxxxx.s3-ap-northeast-1.amazonaws.com/hoge

error_logに時々こんなエラーが出て、502エラーで返してしまう
(全リクエストの3%くらい)

[Thu Apr 01 00:00:00 2014] [error] [client xxx.xxx.xxx.xxx] (20014)Internal error: proxy: error reading status line from remote server xxxxxx.s3-ap-northeast-1.amazonaws.com
[Thu Apr 01 00:00:00 2014] [error] [client xxx.xxx.xxx.xxx] proxy: Error reading from remote server returned by /hoge

この辺りを見ながら、proxy-initial-not-pooled を有効にすればよさそうと判断
http://lasecwww.epfl.ch/manual/ja/mod/mod_proxy_http.html
http://ttaka.dip.jp/maniax/?ReverseProxy%E3%81%AE%E8%A8%AD%E5%AE%9A

設定を以下のように修正し、502エラーが発生しなくなりました

SetEnv proxy-initial-not-pooled 1

ProxyPass /hoge http://xxxxxx.s3-ap-northeast-1.amazonaws.com/hoge
ProxyPassReverse /hoge http://xxxxxx.s3-ap-northeast-1.amazonaws.com/hoge
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