Navigate before initializing page state

admin/routes.py

@@ -6,12 +6,13 @@ import secrets
 from datetime import UTC, datetime
 from pathlib import Path
 from typing import Annotated, Any
+from urllib.parse import urlsplit
 
 import speedtest  # type: ignore[import-untyped]
 from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.responses import FileResponse
 from fastapi.security import HTTPBasic, HTTPBasicCredentials
-from pydantic import BaseModel
+from pydantic import BaseModel, field_validator
 
 from admin.models import (
     delete_flow_config,
@@ -91,6 +92,17 @@ class FlowConfigIn(BaseModel):
     scenario: str = "dynamic"
     stop_on_first_click: bool = False
 
+    @field_validator("target_url")
+    @classmethod
+    def validate_target_url(cls, value: str) -> str:
+        value = value.strip()
+        if value and "://" not in value:
+            value = f"https://{value}"
+        parsed = urlsplit(value)
+        if parsed.scheme not in {"http", "https"} or not parsed.netloc:
+            raise ValueError("Target URL must be a complete HTTP(S) URL")
+        return value
+
 
 def _to_db_dict(body: FlowConfigIn) -> dict[str, Any]:
     return {
@@ -181,6 +193,11 @@ async def add_to_batch_queue(body: BatchTaskIn, _: Auth) -> dict[str, object]:
         raise HTTPException(
             status_code=404, detail=f"Flow config {body.config_id} not found"
         )
+    if not str(cfg.get("target_url") or "").strip():
+        raise HTTPException(
+            status_code=422,
+            detail="The selected flow config has no Target URL. Edit and save it first.",
+        )
 
     result = enqueue(cfg, body.workers, body.total_runs, body.stagger_ms, body.headless)
     log.info(