Live Reload not working with --basehref

[mucbits]

🐞 Bug report

Command (mark with an x)

• new
• build
• serve
• test
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Is this a regression?

Yes, the previous version in which this bug was not present was: 0.803.13

Description

Live Reload stopped working after this change:
5260bbb#diff-6c0b312b8bd33db747e50549a66f7ab1

https://localhost:xxxx/admin/sockjs-node/info returns 404

while https://localhost:xxxx/admin/admin/sockjs-node/info exists.

🔬 Minimal Reproduction

ng serve app --base-href /admin/ --deploy-url /admin/

🔥 Exception or Error

https://localhost:xxxx/admin/sockjs-node/info returns 404

[clydin]

I am unable to replicate the issue. Tried with a new project using the latest version of 8.x (8.3.19)

npx @angular/cli@8 new livereload-basehref
cd livereload-basehref
ng serve --base-href /admin/ --deploy-url /admin/

Is this reproducible for you in a new project?

[mucbits]

I'm using a .Net Core backend with UseAngularCliServer for development, the project I'm working on is rather large with 3 Angular app. Anyway, in the end it does only run 3 times ng serve in the background and proxy all requests to the right instance.

For the root App Live Reload is working fine, the other two apps with the additional path mapping it is not working anymore.

I'll try to reproduce it on a smaller test project.

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