Fix

backend/runner/app.py

@@ -134,22 +134,27 @@ def presign_upload():
     }
     """
     run_id = uuid.uuid4().hex
-    # We'll use a local file path as the "imageKey"
     image_key = f"artifacts/{run_id}.jpg"
-    # Local upload endpoint URL (where the front-end will POST the file)
-    upload_url = request.host_url + f"upload/{run_id}"
-    # Return the run info and upload instructions 
-    # (fields remain empty for compatibility)
-    response = jsonify(
-        {
-            "runId": run_id,
-            "imageKey": image_key,
-            "upload": {
-                "url": upload_url,
-                "fields": {},  # no fields needed for local upload
-            },
-        }
-    )
+    
+    # Fix: Use the correct Hugging Face Space URL
+    # In Hugging Face Spaces, we need to construct the URL properly
+    if os.getenv("HF_SPACE_URL"):
+        # Use environment variable if set
+        base_url = os.getenv("HF_SPACE_URL")
+    else:
+        # Fallback: try to get from request headers or use default
+        base_url = request.headers.get('X-Forwarded-Proto', 'https') + "://" + request.headers.get('X-Forwarded-Host', request.host)
+    
+    upload_url = f"{base_url}/upload/{run_id}"
+    
+    response = jsonify({
+        "runId": run_id,
+        "imageKey": image_key,
+        "upload": {
+            "url": upload_url,
+            "fields": {},
+        },
+    })
     return response