502 is bad gateway, which means that apache and the back-end server have got into a protocol argument. Usually this is due to a bad response from the back-end (as your log entries indicate). Why do you think apache is the problem? Rgds, Owen Boyle Disclaimer: Any disclaimer attached to this message may be ignored. ________________________________ From: Cristian Pini [mailto:cris.pini@xxxxxxxxx] Sent: Thursday, November 26, 2009 6:19 PM To: users@xxxxxxxxxxxxxxxx Subject: mod_proxy issue - intermittent 502 response Hi, I'm running Apache/2.0.52 as a reverse proxy on a RHE4 box, the backend app server is on a separate machine again RHE4, running Apache/2.0.52 and mod_perl 1.99_16. There are intermittent 502 responses being generated by the proxy although a page refresh generally resolves the issue, we are trying to get a configuration of 2 RP boxes in front of 3 mod_perl app servers into production but will need to understand / resolve the issue of these intermittent 502 responses first. [Thu Nov 26 15:35:09 2009] [error] [client 88.96.233.45] proxy: error reading status line from remote server xxx.xxxxxx.co.uk, referer: http://xxx.xxxx.co.uk/mens/casual/casual/71/brand-/all-/start- [Thu Nov 26 15:35:09 2009] [error] [client 88.96.233.45] proxy: Error reading from remote server returned by /mens/smart/smart/70/brand-/all-/start-, referer: http://xxxx.xxxxxxx.co.uk/mens/casual/casual/71/brand-/all-/start- Can someone shed further light on what the problem is and how to resolve it pls, I'm happy to send virtual host confs if someone wishes to dig little deeper. Note at this point I'm using mod_rewrite [P] to proxy the requests to the app server rather than using ProxyPass as we have many rewrites in the conf. I've googled around and have seen that others have observed similar scenarios when using this setup in Apache 2.0 but have not seen anything specific about a resolution or path to resolution. Your help gratefully appreciated. Kind regards, Cris Cristian Pini Foresite Business Solutions Ltd Tel: 020 8540 0040 Direct: 020 8545 6813 http://www.fsite.com This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. If you receive this message in error, please notify the sender urgently and then immediately delete the message and any copies of it from your system. Please also immediately destroy any hardcopies of the message. The sender's company reserves the right to monitor all e-mail communications through their networks. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
|