🐞 Bug Summary

Playwright test suite fails with "404 default backend" errors when running against path-prefixed deployments. APIRequestContext resolves absolute URL paths (starting with /) from domain root instead of from base_url, causing API calls to hit wrong endpoints.

🧩 Affected Component

Select the area of the project impacted:

• mcpgateway - API
• mcpgateway - UI (admin panel)
• mcpgateway.wrapper - stdio wrapper
• Federation or Transports
• CLI, Makefiles, or shell scripts
• Container setup (Docker/Podman/Compose)
• Other (explain below)

Playwright test suite

🔁 Steps to Reproduce

1. Deploy MCP Gateway to environment with path prefix set in APP_ROOT_PATH (e.g., /test)
2. Configure Playwright tests with path-prefixed base_url
3. Run Playwright tests, e.g: pytest tests/playwright/test_admin_ui.py
   Observe test failures with "404 default backend" errors

🤔 Expected Behavior

APIRequestContext calls should resolve relative to the configured base_url, regardless of whether the deployment uses a path prefix. Tests using api_request_context.post("/teams/") should hit {base_url}/{app_root_path}/teams/, not {base_url}/teams/.

📓 Logs / Error Output

FAILED tests/playwright/test_rbac_permissions.py::TestRBACGatewayCreate::test_admin_create_gateway_all_teams_view[chromium]
AssertionError: Failed to create team: 404 default backend - 404

Error at line 208:
assert resp.ok, f"Failed to create team: {resp.status} {resp.status_text} - {resp.text()}"