There was a change to this article yesterday that changed the connector protocol from
Is this change only applicable to new installations of Jira or should I update my existing connector to match?
I'm using this same code to run Confluence over HTTPS. Does this same change apply?
That change was made to reflect the current defaults for JIRA's Tomcat configuration. The difference between the two connector protocols is how it manages incoming connections and CPU threads.
HTTP/1.1 uses a blocking connector by default, by specifically calling out org.apache.coyote.http11.Http11NioProtocol it will force Tomcat to use a non-blocking connector. https://techblog.bozho.net/tomcats-default-connectors/ is a great read to get a basic understanding of the difference.
If you have a current working Atlassian applications running over HTTPS I wouldn't worry about changing it immediately (although it would be a good idea to make a change when you have a maintenance window). If, however, you've had problems with 503/504 errors it would make sense to change your configuration.
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