diff --git a/routes/reslevis.py b/routes/reslevis.py
index 67df1f7..99c47f6 100644
--- a/routes/reslevis.py
+++ b/routes/reslevis.py
@@ -1,8 +1,10 @@
 import asyncio
+import json
 from fastapi import APIRouter, Depends, HTTPException, Query, Request
 import httpx
 import config_env
 from typing import List, Optional
+from urllib.parse import urlencode
 
 from schemas.reslevis import (
     BuildingItem,
@@ -170,12 +172,42 @@ async def _core_get_json(
         raise HTTPException(status_code=502, detail="Invalid CORE response") from exc
 
 
+async def _core_get_json_via_curl(
+    path: str,
+    params: Optional[dict] = None,
+):
+    query_string = urlencode(params or {})
+    url = f"{CORE_BASE_URL}{path}"
+    if query_string:
+        url = f"{url}?{query_string}"
+
+    cmd = ["curl", "-sS", "-X", "GET"]
+    if CORE_BASE_URL.startswith("https://"):
+        cmd.append("-k")
+    cmd.append(url)
+
+    process = await asyncio.create_subprocess_exec(
+        *cmd,
+        stdout=asyncio.subprocess.PIPE,
+        stderr=asyncio.subprocess.PIPE,
+    )
+    stdout, stderr = await process.communicate()
+
+    if process.returncode != 0:
+        detail = (stderr or stdout).decode("utf-8", errors="replace").strip() or "CORE curl request failed"
+        raise HTTPException(status_code=502, detail=detail)
+
+    try:
+        return json.loads(stdout.decode("utf-8"))
+    except ValueError as exc:
+        raise HTTPException(status_code=502, detail="Invalid CORE response") from exc
+
+
 async def _fetch_tracks_for_tracker(
-    client: httpx.AsyncClient,
     tracker_id: str,
     params: Optional[dict] = None,
 ) -> List[dict]:
-    payload = await _core_get_json(client, f"/reslevis/getTracks/{tracker_id}", params=params)
+    payload = await _core_get_json_via_curl(f"/reslevis/getTracks/{tracker_id}", params=params)
     if not isinstance(payload, list):
         raise HTTPException(status_code=502, detail="Unexpected CORE response type")
     return [_normalize_track(row) for row in payload if isinstance(row, dict)]
@@ -186,22 +218,21 @@ def _sort_tracks_desc(rows: List[dict]) -> List[dict]:
 
 
 async def _fetch_all_tracks(params: dict) -> List[dict]:
-    async with httpx.AsyncClient(timeout=30.0, verify=False) as client:
-        trackers_payload = await _core_get_json(client, "/reslevis/getTrackers")
-        if not isinstance(trackers_payload, list):
-            raise HTTPException(status_code=502, detail="Unexpected CORE tracker response type")
-
-        tracker_ids = []
-        for item in trackers_payload:
-            if not isinstance(item, dict):
-                continue
-            tracker_id = item.get("id")
-            if tracker_id:
-                tracker_ids.append(str(tracker_id))
-
-        batches = await asyncio.gather(
-            *[_fetch_tracks_for_tracker(client, tracker_id, params) for tracker_id in tracker_ids]
-        )
+    trackers_payload = await _core_get_json_via_curl("/reslevis/getTrackers")
+    if not isinstance(trackers_payload, list):
+        raise HTTPException(status_code=502, detail="Unexpected CORE tracker response type")
+
+    tracker_ids = []
+    for item in trackers_payload:
+        if not isinstance(item, dict):
+            continue
+        tracker_id = item.get("id")
+        if tracker_id:
+            tracker_ids.append(str(tracker_id))
+
+    batches = await asyncio.gather(
+        *[_fetch_tracks_for_tracker(tracker_id, params) for tracker_id in tracker_ids]
+    )
 
     merged = [row for batch in batches for row in batch]
     merged = _sort_tracks_desc(merged)
@@ -402,13 +433,9 @@ async def getTracks(
 
     selected_tracker_id = tracker_id or request.query_params.get("id")
 
-    try:
-        if selected_tracker_id:
-            async with httpx.AsyncClient(timeout=30.0, verify=False) as client:
-                return await _fetch_tracks_for_tracker(client, selected_tracker_id, params)
-        return await _fetch_all_tracks(params)
-    except httpx.RequestError as exc:
-        raise HTTPException(status_code=502, detail=f"CORE request failed: {exc}") from exc
+    if selected_tracker_id:
+        return await _fetch_tracks_for_tracker(selected_tracker_id, params)
+    return await _fetch_all_tracks(params)
 
 
 @router.get(
@@ -431,11 +458,7 @@ async def getTrack(
     if to:
         params["to"] = to
 
-    try:
-        async with httpx.AsyncClient(timeout=30.0, verify=False) as client:
-            return await _fetch_tracks_for_tracker(client, tracker_id, params)
-    except httpx.RequestError as exc:
-        raise HTTPException(status_code=502, detail=f"CORE request failed: {exc}") from exc
+    return await _fetch_tracks_for_tracker(tracker_id, params)
 
 
 @router.post("/postTrack", tags=["Reslevis"], dependencies=[Depends(get_current_user)])