Tailored error message for custom host

[aparzi]

Add custom middleware for to present an Angular-tailored message

Fix #32028

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

The error message thrown when the Angular app is served via a custom hostname is incorrect/misleading

Issue Number: #32028

What is the new behavior?

Add custom middleware for to present an Angular-tailored message when angular served by ngrok

Does this PR introduce a breaking change?

• Yes
• No

[alan-agius4]

LGTM, thanks

(pushed a cleanup commit)

[hybrist]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 30b5d81
• 21.0.x: 778b4cf

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