Connection pool behavior on expiring certificates

[telcy]

I am using an async client (connection pool) and sending a request every x minutes. The third party API SSL certificate was valid when the application started and expired some days later (a new SSL certificate does exist).

error sending request for url (https://...): error trying to connect: error:0A000086:SSL routines:tls_post_process_server_certificate:certificate verify failed:../ssl/statem/statem_clnt.c:1883: (certificate has expired)

I have received this error for approx. 2.5 hours before it started working again.

What is the current behavior for pooled connections and certificates that have expired while running?

[seanmonstar]

That error points out it was trying to connect, so it wasn't a pooled connection. If you're using the default TLS, it's just using openssl's defaults, in case it caches certificates.