There are a number of calls in zerver/views/auth.py to get_realm -- and most, but not all, catch the potential Realm.DoesNotExist exception that that raises. The ones that don't currently should catch the Realm.DoesNotExist and raise a JsonableError, to prevent 500's like this:

$ curl -sSX POST https://invalid.zuli

But there are exist no difficulties in MP scenarios. It shows »Medium« as fallback. Maybe the whole line can be skipped.

Is your feature request related to a problem? Please describe.
Getting a server by its visible ID requires many requests.
if I want to get a specific server using the ID visible to the user (example: efcecec0) I will have to list all servers and then filter the list. but that requires a lot of requests depending on the number of pages you have.

Describe the solution you'd like
can yo