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


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

This question came from our site for pro webmasters.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.