Fix URL building for SPA proxying

[varsi94]

Fix URL building for SPA proxying

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Fix URL building when proxying to a host where the SPA is not on the root URL

Description

If the SPA proxy is not listening on the root url (e.g. http://localhost:3000/spa), then the path segments are ignored when sending the request to the development server. This path segment is prepended to the URL, if there's any.

Fixes #31229

[ghost]

Thanks for your PR, @varsi94. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[mkArtakMSFT]

@MackinnonBuck please talk to Javier about this if you have any questions, and then review this PR. Thanks!

[Tratcher]

Want to fix #43662 while you're at it? It's likely on the same line.

[varsi94]

@Tratcher Fixed #43662 as well.

[Tratcher]

@MackinnonBuck can you do some manual testing for both of these bugs? It doesn't look like there's any automated tests for this.

[dnfadmin]

All CLA requirements met.

[varsi94]

@MackinnonBuck can you do some manual testing for both of these bugs? It doesn't look like there's any automated tests for this.

I have added some, you can check. @MackinnonBuck @Tratcher

[MackinnonBuck]

Just now getting to this - I have one piece of feedback but otherwise it looks great!

Thanks for your contribution @varsi94!

[MackinnonBuck]

🎉