We have a configuration as follows:
Apache2 httpd with mod_proxy (2.2.15) in the DMZ
Java server process with embedded Jetty in the secure zone
All calls to the Java server are POST made by an iPad application
The mod_proxy configuration looks like this:
<VirtualHost ……. >
ProxyRequests Off
ProxyPreserveHost On
<Proxy *>
Order allow,deny
Allow from all
</Proxy>
ProxyPass /ls http://jetty:8080/url
ProxyPassReverse /ls http://jetty:8080/url
</VirtualHost>
Sporadically, quite disturbingly it is about every 4th or 5th HTTP
POST, we get this:
502 error sent back to the iPad application and at that moment in the
httpd error log we get this:
[Fri Jun 01 17:06:28 2012] [error] [client 71.197.43.86]
(20014)Internal error: proxy: error reading status line from remote
server ……….
[Fri Jun 01 17:06:28 2012] [error] [client 71.197.43.86] proxy: Error
reading from remote server returned by …..
(URLs obfusaced)
I tried everything under the sun and different combinations of it, with
no luck.
SetEnv proxy-nokeepalive 1
#SetEnv force-proxy-request-1.0 1
SetEnv proxy-initial-not-pooled 1
#SetEnv proxy-sendcl 1
Now, one thing is that in the QA environment there is a firewall and
xinetd in between Apache and Jetty. In dev environment that isn ot the
case, and I haven't tried it in dev yet. But the problem persists in
both places.
I don't believe this is unique to Jetty as I found plenty of discussion
about Tomcat, weblogic, IIS, etc. having this problem.
Any thoughts are greatly appreciated.
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