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https://bz.apache.org/bugzilla/show_bug.cgi?id=66111

Bug ID: 66111
Summary: Mod Hcheck works only inside virtualhost
Product: Apache httpd-2
Version: 2.4.52
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy_hcheck
Assignee: bugs@httpd.apache.org
Reporter: riccardo.vezzini@gmail.com
Target Milestone: ---

Hi,
I'm running an apache 2.4.52 compiled from source.

When I setup mod_proxy_hcheck *outside* a virtual host section, I encounter
some issues.
inside webserver logs I found this entry:

/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:42:20.519298
2022] [proxy_hcheck:trace4] [pid 15022:tid 140163408184960]
mod_proxy_hcheck.c(1110): AH10019: Missing unique per-server context:
02srv00p8m.hosts.eni.intranet (24fbe00:246d888) (no hchecks)

health check seems to be working (in backend's logs I found calls to my hcuri
url) but nothing is traced inside webserver logs other than the "(no hchecks)"
entry.

Our setup is pretty simple:

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule watchdog_module modules/mod_watchdog.so
LoadModule proxy_hcheck_module modules/mod_proxy_hcheck.so
LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
LoadModule lbmethod_bybusyness_module modules/mod_lbmethod_bybusyness.so

ProxyHCTemplate 200keep hcmethod=GET hcinterval=60 hcpasses=1 hcfails=3
hcuri=/pub/hc.html

Header add Set-Cookie "APACHE_ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/"
env=BALANCER_ROUTE_CHANGED
<Proxy balancer://AppCluster>
BalancerMember https://server1 route=1 hctemplate=200keep
BalancerMember https://server2 route=2 hctemplate=200keep
ProxySet stickysession=APACHE_ROUTEID
ProxySet lbmethod=bybusyness
</Proxy>

If I add an ProxyHCTemplate or ProxyHCExpr entry inside the virtualhost block,
even if not used, it seems to work flawlessy:

/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:32.655045
2022] [proxy_hcheck:debug] [pid 27347:tid 140163407734528]
mod_proxy_hcheck.c(550): AH03249: DNS lookup failure for: www3.example.com:80
/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:32.655085
2022] [proxy_hcheck:debug] [pid 27347:tid 140163407734528]
mod_proxy_hcheck.c(590): AH03251: Health check TCP Status (1) for 24ad1d8.
/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:34.686161
2022] [proxy_hcheck:debug] [pid 15022:tid 140163408184960]
mod_proxy_hcheck.c(1125): AH03265: watchdog callback registered (_proxy_hcheck_
for server0)

/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:27.618657
2022] [proxy_hcheck:debug] [pid 15022:tid 140163408184960]
mod_proxy_hcheck.c(1125): AH03265: watchdog callback registered (_proxy_hcheck_
for server0)
/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:29.621119
2022] [proxy_hcheck:debug] [pid 27347:tid 140163407734528]
mod_proxy_hcheck.c(961): AH03258: _proxy_hcheck_ watchdog started.
/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:29.621661
2022] [proxy_hcheck:debug] [pid 27347:tid 140163407734528]
mod_proxy_hcheck.c(975): AH03313: apr_thread_pool_create() with 16 threads
succeeded
/appl/apache/hcheck-www1-sd/logs/error_vhost_log:[Thu Jun 09 18:55:32.625650
2022] [proxy_hcheck:trace3] [pid 27347:tid 140163407734528]
mod_proxy_hcheck.c(1012): Checking balancer://foo worker: https://server1/ [1]
(24ad1d8)

It seems to be the exact opposite of bug #1600579

Am I doing something wrong?
Thanks!

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