nrichter at gmail
Jul 3, 2009, 9:56 AM
Views: 218
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implementing an SLA for a request in apache
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Hi,
Here's a problem I'd like to solve. Configure apache to receive a
request and proxy/forward it off to a backend app server (tomcat) ..
wait a specified period of time .. and no response is received send
back a static file or a return code like 204.
Essentially it's a combination between the below mod_rewrite and
mod_alias directives with a timeout. Below example uses solr without
loss of generality.
RedirectMatch 204 /search/(.*)$
RewriteRule ^/search/(.*)$ http://backend:8080/solr/$1 [P]
Logic below:
If url matches rewrite-rule regex then
{
set timer for 500ms with timer_callback()
force proxy to secondary url after rewriting it
if(response from proxy is > 199 and < 300)
return response
else
return 204
}
timer_callback()
{
send back 204
}
Instead of returning 204 one could also serve back a static file.
The general idea is to expose a url that has a near-guaranteed
response time limit where a 204 or static default is acceptable
behaviour.
I suspect that we'll need to write an apache module to do this.. yet
surely this question has been asked before? Ideas?
Thanks - Neal
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implementing an SLA for a request in apache
