Simple proxy occasionally fails

[Kris S. Amundson]

Simple proxy config fails occasionally with errors.  Apache and nginx are
running on 4 web servers.  Nginx is used by the web app to proxy between two
lucene/solr search servers.

Nginx config on each web server:
http://pastebin.com/m12448635

Every so often I get a crit error:
http://pastebin.com/m4dbfe328

My first expedition into using nginx.  Pointing the web app to use one
lucene/solr server directly works fine.

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