ApplicationSet PullRequest Generator Regex Mismatch error for webhook event

Checklist:

[x] I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
[x] I've included steps to reproduce the bug.
[x] I've pasted the output of argocd version.

Describe the bug I am using PullRequest generator for ApplicationSet with Github. I did setup webhook for applicationset via another ingress per the note mentioned in applicationset webhook configuration. My github host doesn't has a port, but the regex used in ArgoCD expects a colon followed by a port number as in :443. Without that, my webhook is not processed and PullRequest generator waits for time defined in requeueAfterSeconds parameter. The colon and port part of the regex after hostname should be optional and work without providing colon and port number.

My Github host: https://github.corp.redacted.com Regex expected github host: https://github.corp.redacted.com:443 To Reproduce

Create a PullRequest Generator applicationset using api:
Create a webhook from github for applicationset ingress resource. This is different from argocd-server ingress. If you do not configure ingress for applicationset then webhook will deliver to argocd-server
Create a PullRequest which will trigger an event in applicationset

Expected behavior A refresh should happen in the application that is controlled by my applicationSet and show below message in logs

time="2024-07-22T18:12:20Z" level=info msg="refresh ApplicationSet kube-argocd/aws-ebs-csi-driver from webhook"

Screenshots

Version

argocd version
argocd: v2.10.7+b060053.dirty
  BuildDate: 2024-04-15T12:31:39Z
  GitCommit: b060053b099b4c81c1e635839a309c9c8c1863e9
  GitTreeState: dirty
  GoVersion: go1.22.2
  Compiler: gc
  Platform: darwin/arm64
argocd-server: v2.10.7+b060053

To fix the problem:

update api parameter to api: https://github.corp.redacted.com:443
Update applicationSet via kubectl apply -f <filename>
Create a Pull Request which will trigger an event in applicationSet.

Logs

This is what I see when I don't use :443 for api parameter in pullRequest generator. This happens for all pull request events

time="2024-07-22T18:00:23Z" level=debug msg="https://github.corp.redacted.com does not match (?i)([http://|https://|\\w+@|ssh://(\\w+@)](about:blank)?)github.corp.redacted.com(:[0-9]+|)[:/]"

Once :443 is added to my github host and updated applicationset, I see the following in the logs.

time="2024-07-22T18:11:11Z" level=info msg="refresh ApplicationSet kube-argocd/aws-ebs-csi-driver from webhook"
time="2024-07-22T18:52:48Z" level=info msg="generated 1 applications" applicationset=kube-argocd/aws-ebs-csi-driver

argoproj / argo-cd

ApplicationSet PullRequest Generator Regex Mismatch error for webhook event #19150