Apache internal dummy connections
They are an internal Apache mechanism used for things like creating new child processes. They are nothing for you to worry about.
There is a way to do it in your httpd.conf file. You probably have this line:
CustomLog "logs/access_log" combined
Change it to this:
SetEnvIf Remote_Addr "127\.0\.0\.1" dontlog
CustomLog "logs/access_log" combined env=!dontlog
Source: https://www.electrictoolbox.com/apache-stop-logging-internal-dummy-connection/