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Using httpd 2.2 on CentOS 6, I'm trying to setup a handful of forward proxies using mod_proxy/ProxyPass, several of which should reuse connection pooling for a limited time (15 seconds, in my case) and then close the connection. I need to close the pooled connection because the backend will drop idle connections after 5 minutes.

I'm also using prefork and I don't know if this is effecting the ttl behavior or not.

<IfModule prefork.c>
  StartServers 5
  MinSpareServers 5
  MaxSpareServers 10
  ServerLimit 128
  MaxClients 128
  MaxRequestsPerChild 10000
</IfModule>

...

ProxyPass /url1 https://internal1.example.com ttl=15
ProxyPass /url2 https://internal2.example.com ttl=15
ProxyPass /url3 https://internal3.example.com

What I'm seeing is each worker process still has an idle established connection (confirmed idle via tcpdump) to the backend until 5 minutes later when the backend sends a reset. If I use the proxy again within the 5 minutes, but far after the ttl=15 has expired, the workers reuse their connections/ports (confirmed httpd debug logging not creating a new ssl connection).

Googling around, some other people have seen similar behavior:

migrated from webmasters.stackexchange.com May 9 '18 at 23:22

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