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From Rainer Jung <rainer.j...@kippdata.de>
Subject Re: [users@httpd] AJP proxy timeout problem
Date Fri, 28 Oct 2011 08:16:58 GMT
Which version of httpd?

On 28.10.2011 08:49, SpliFF wrote:
> I've having an issue where a long-running backend script behind AJP is causing apache
to error with "Service Temporarily
> Unavailable" after exactly 5 minutes.
> 
> I tried to solve this by moving from mod_rewrite to mod_proxy, with the following configuration:
> 
>     # Search Engine Safe URL rewrite
>     # Redirect Coldfusion requests to index.cfm
>     # matches /file.mp4 but not /file:name.mp4 (ie; is a real file)
>     RewriteCond %{REQUEST_FILENAME} !/[^/:]+\.[^/:]{2,5}$
>     RewriteRule (.*) /index.cfm$1 [PT]
> 
>     # Proxy CFML files to Jetty via AJP connector
>     <Proxy *>
>     Allow from 127.0.0.1
>     </Proxy>
>     ProxyPreserveHost On
>     ProxyRequests Off
>     ProxyPassMatch ^/(.+\.cf[cm])(/.*)?$ ajp://localhost:8009/$1$2 connectiontimeout=6000
timeout=6000
> 
> 
> If I'm not mistaken those timeouts are in seconds so AJP should be waiting at least 100
minutes.
> 
> I also made sure the Railo backend would wait long enough, using the following CFML tag:
> 
> <cfsetting requesttimeout=6000 />
> 
> I checked the Jetty (Application server) config but there doesn't seem to be any timeout
options.
> 
> The apache error log (with debugging) says:
> 
> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(45): proxy: AJP: canonicalising URL
> //localhost:8009/index.cfm/subscribers/importold
> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(1525): [client 192.168.1.60] proxy: *:
found reverse proxy worker for
> ajp://localhost:8009/index.cfm/subscribers/importold
> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy.c(1015): Running scheme ajp handler (attempt
0)
> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(659): proxy: AJP: serving URL
> ajp://localhost:8009/index.cfm/subscribers/importold
> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2011): proxy: AJP: has acquired connection
for (*)
> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2067): proxy: connecting
> ajp://localhost:8009/index.cfm/subscribers/importold to localhost:8009
> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2193): proxy: connected /index.cfm/subscribers/importold
to localhost:8009
> [Fri Oct 28 15:28:45 2011] [debug] proxy_util.c(2444): proxy: AJP: fam 2 socket created
to connect to *
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(224): Into ajp_marshal_into_msgb
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[0]
[Host] =
> [users.arcmail.betamax.arc.net.au]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[1]
[User-Agent] = [Mozilla/5.0 (X11;
> Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[2]
[Accept] =
> [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[3]
[Accept-Language] = [en-us,en;q=0.5]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[4]
[Accept-Encoding] = [gzip, deflate]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[5]
[Accept-Charset] =
> [ISO-8859-1,utf-8;q=0.7,*;q=0.7]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[6]
[DNT] = [1]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[7]
[Connection] = [keep-alive]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(290): ajp_marshal_into_msgb: Header[8]
[Cookie] =
> [CFID=d5b4b21d-bea4-4875-b2f3-7dc003c7fa64; CFTOKEN=0; FW_BUGZ=; RAILO_ADMIN_LANG=en;
RAILO_ADMIN_LASTPAGE=server.cache]
> [Fri Oct 28 15:28:45 2011] [debug] ajp_header.c(450): ajp_marshal_into_msgb: Done
> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(265): proxy: APR_BUCKET_IS_EOS
> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(270): proxy: data to read (max 8186
at 4)
> [Fri Oct 28 15:28:45 2011] [debug] mod_proxy_ajp.c(285): proxy: got 0 bytes of data
> [Fri Oct 28 15:28:46 2011] [debug] ajp_header.c(687): ajp_read_header: ajp_ilink_received
06
> [Fri Oct 28 15:28:46 2011] [debug] ajp_header.c(697): ajp_parse_type: got 06
> [Fri Oct 28 15:33:46 2011] [error] ajp_read_header: ajp_ilink_receive failed
> [Fri Oct 28 15:33:46 2011] [debug] mod_proxy_ajp.c(531): (120006)APR does not understand
this error code:
> ajp_read_header failed
> [Fri Oct 28 15:33:46 2011] [debug] mod_proxy_ajp.c(546): proxy: Processing of request
failed backend: 1, output: 0
> [Fri Oct 28 15:33:46 2011] [error] (120006)APR does not understand this error code: proxy:
dialog to (null) (*) failed
> [Fri Oct 28 15:33:46 2011] [debug] proxy_util.c(2029): proxy: AJP: has released connection
for (*)
> 
> Note the delay between "ajp_parse_type: got 06" and "ajp_ilink_receive failed" is 5 minutes
accurate to the second. I
> read somewhere that 5 minutes is the default timeout for mod_proxy so my suspicion is
the timeout settings are being
> ignored. The only other theory I have is that the [PT] flag on the first rewrite rule
is causing those values to be ignored.

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