make frontend.url parameter more lenient

[inodb]

Currently it needs to be provided like:

frontend.url=https://frontend.cbioportal.org/

but if you forgot the trailing slash everything breaks, e.g.:

frontend.url=https://frontend.cbioportal.org

Let's add a trailing slash if missing

[SatyanshMittal]

it's working!

[panevka]

Hey, I would like to work on this issue.

Could you please specify where can this param be found and when/where/how does it need to be passed? (eg. frontend/backend, during deployment/during build, is it a config file/command/else)

I will be grateful for any additional info.

I dug a bit and found some mentions in the docs, but it's unclear to me whether this is the same thing and how does it relate to this issue.

[Ismael-Sallami]

Hi! I'm Ismael, a CS and Business Administration student. I've successfully set up the local development environment and I'm very interested in this issue as it aligns with my interest in data integrity and Python. I would like to work on this; could you please assign it to me?

[VarshiniGunti]

I’ve opened a PR that addresses this by normalizing frontend.url to ensure a trailing slash is present when missing.

PR: #11972

The fix keeps existing behavior intact while making the configuration more forgiving, and adds unit tests covering missing slash, whitespace, and runtime override cases.