Thanks for getting back to me. > Could it be a timeout while waiting for the reply? Add "%D" to your LogFormat and check, how long those requests take. The following is an Apache's access_log when the HTTP 503 error occured. It seems the request took only "42ms" so I think it's not because of a timeout. xxx.xxx.xxx.xxx - - [09/Aug/2010:03:38:32 +0900] "GET /api/alive.jsp HTTP/1.1" 503 2366 0 42324 > I didn't understand the "the errors disappeared instead of cping/cpong retry occurrence" part of your question. I'm sorry I'm not good at using English well. It's my understanding that: 1. "ping" option gets Apache to check the connection to the backend.2. If the first CPing/CPong check doesn't succeed, it will reestablish a new connection to the backend and run one more CPing/CPong.
When I set "ping=1" option to ProxyPass directive, Apache failed the first CPing/CPong check, but succeeded at connecting to backend by the second CPing/CPong.
So HTTP 500/503 error didn't occur. I wonder if the connection will break instantaneously(within 1 second). Would you give me any comments about this phenomenon? (2010/10/08 20:19), Rainer Jung wrote:
On 08.10.2010 09:33, Yu Kikuchi wrote:My environment is Apache 2.2.11 and JBoss AS 5.0.0. There were no messages in JBoss's access log when the error occured. I had changed the setting to use "mod_proxy_http" the day before yesterday, then not HTTP 503 error but 502 error occured. Are anybody onto something about this error? Are there any ideas to pursue the exact cause of it? (2010/10/07 18:50), Yu Kikuchi wrote:Hello. Apache wrote such as following messages into error_log and returned HTTP 500/503 error infrequently. [error] (104)Connection reset by peer: ajp_ilink_receive() can't receive header [error] ajp_read_header: ajp_ilink_receive failed [error] (120006)APR does not understand this error code: proxy: read response failed from xxx.xxx.xxx.xxx:8009 (xxx.xxx.xxx.xxx) I have installed Apache and JBoss Application Server into the same server. I suspected mod_proxy_ajp caused the errors because JBoss hasn't logged any messages and left indications of abort. After the setting of "ping" options, the errors disappeared instead of cping/cpong retry occurrence. Exactly: --------------------------------------------------- <Location /test> ProxyPass ajp://xxx.xxx.xxx.xxx:8009/test ping=1 </Location> --------------------------------------------------- I examine prior occurrences, but nobody told about the cause of this phenomenon. Does anybody tell me why the errors came up?Could it be a timeout while waiting for the reply? Add "%D" to your LogFormat and check, how long those requests take. I didn't understand the "the errors disappeared instead of cping/cpong retry occurrence" part of your question. Regards, Rainer --------------------------------------------------------------------- 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
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