BMP Web App

Endpoint
GET /auth/username-availability/{username}

Purpose
Check whether the entered username already exists or is available for registration.

Implementation Notes

Send request using public headers without logged-in user token
Parse:
success
exists
available
Show real-time validation message in UI

Acceptance Criteria

API is called when user enters username
App shows:
available username
already taken username
API failure state
Proper loader and debounce handling added
Error message shown on request failure

Dev Note
Existing method:

checkUsernameAvailability(String username)
URL:
'$baseUrl/auth/username-availability/$username'