fix api

api.py

@@ -1,5 +1,6 @@
 import requests
 import logging
+import json
 
 class LoadBalancerAPI:
     def __init__(self, base_url):
@@ -12,7 +13,8 @@ class LoadBalancerAPI:
         api_endpoint = f'{self.base_url}/api/register'
         
         try:
-            response = requests.post(api_endpoint, data=data)
+            headers = {'Content-Type': 'application/json'}
+            response = requests.post(api_endpoint, data=json.dumps(data), headers=headers)
             response.raise_for_status()
             return response.json()  # Assuming the API returns JSON
         except requests.exceptions.RequestException as e: