An access from outside to another external host

Help!
1

I have one of these entries in the logfile
can someone explain to me what is happening here ?

haproxy[81647]: x.x.x.x:23394 [01/Oct/2021:23:42:03.917] http http/<NOSRV> 0/-1/-1/-1/0 302 109 - - LR-- 9/5/0/0/0 0/0 {|lenni0451.net:25564} "CONNECT lenni0451.net:25564 HTTP/1.1"

haproxy[2684900]: x.x.x.x:32878 [28/Oct/2021:07:50:59.946] http http/<NOSRV> 0/-1/-1/-1/0 302 110 - - LR-- 7/3/0/0/0 0/0 {|cdn.jsdelivr.net:443} "CONNECT cdn.jsdelivr.net:443 HTTP/1.1"

2 
 LR   The request was intercepted and locally handled by haproxy. Generally
      it means that this was a redirect or a stats request.

Notice the HTTP method which is CONNECT. Most likely a client is erroneously configured to talk to haproxy as it would be a forwarding proxy (when it really is a reverse proxy).