Router should support case-insensitive root index.html

🚀 feature request

Relevant Package

This feature request is for @angular/router.

Description

I am aware that Router paths are case-sensitive. While personally I disagree with that, I can work around it with a custom DefaultUrlSerializer. What I cannot work around is when a request comes in for /INDEX.HTML. While my custom DefaultUrlSerializer will essentially make Router work with case-insensitive URLs by lower-casing everything, it doesn’t appear to work for /INDEX.HTML.

I am also aware that the case-sensitivity problem has been brought up before (https://github.com/angular/angular/issues/7691, etc), but I think this is a unique case that is worth looking at.

Describe the solution you’d like

Since Router already appears to handle /index.html internally somewhere, I think in this one-off case it should handle it in a case-insensitive manner to prevent the Cannot match any routes error.

Describe alternatives you’ve considered

I do not see an alternative. I welcome any workarounds!

Sample project / reproduction

I hesitated a bit in considering this a feature request, but in case this is classified as a bug, I put together a repro here.

1. Expand the console on the right and add /index.html to the address bar and refresh. You will not see anything wrong.
2. Try using /INDEX.HTML and you will see an error (in the console), even though my custom DefaultUrlSerializer lower-cased it (as seen in the console).

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