Call Khoj chat API as POST request with payload in request body

The chat API endpoint on the Khoj server was updated into a POST API
endpoint accepting most query parameters (e.g `q') in request body

This change updates the call the modified Khoj chat API to use this
new calling pattern

Author: debanjum

src/flint/helpers.py

@@ -19,7 +19,7 @@
 
 logger = logging.getLogger(__name__)
 
-KHOJ_CHAT_API_ENDPOINT = f"{KHOJ_API_URL}/api/chat?client_id={KHOJ_API_CLIENT_ID}"
+KHOJ_CHAT_API_ENDPOINT = f"{KHOJ_API_URL}/api/chat?client_id={KHOJ_API_CLIENT_ID}&client=whatsapp"
 KHOJ_INDEX_API_ENDPOINT = f"{KHOJ_API_URL}/api/v1/index/update?client_id={KHOJ_API_CLIENT_ID}&client=whatsapp"
 
 KHOJ_CLOUD_API_SESSION = Session()
@@ -126,7 +126,6 @@ def send_message_to_khoj_chat(user_message: str, user_number: str) -> str:
     Send the user message to the backend LLM service and return the response
     """
     start_time = time.time()
-    encoded_phone_number = urllib.parse.quote(user_number)
 
     if user_message.startswith(tuple(UNIMPLEMENTED_COMMANDS.keys())):
         return {
@@ -142,10 +141,14 @@ def send_message_to_khoj_chat(user_message: str, user_number: str) -> str:
     else:
         user_message = f"/default {user_message}"
 
-    encoded_user_message = urllib.parse.quote(user_message)
-
-    khoj_api = f"{KHOJ_CHAT_API_ENDPOINT}&phone_number={encoded_phone_number}&q={encoded_user_message}&stream=false&create_if_not_exists=true"
-    response = KHOJ_CLOUD_API_SESSION.get(khoj_api)
+    encoded_phone_number = urllib.parse.quote(user_number)
+    khoj_api = f"{KHOJ_CHAT_API_ENDPOINT}&phone_number={encoded_phone_number}&create_if_not_exists=true"
+    response = KHOJ_CLOUD_API_SESSION.post(
+        khoj_api,
+        json = {
+            "q": user_message,
+            "stream": False,
+    })
 
     end_time = time.time()
     response_time = end_time - start_time
@@ -173,7 +176,7 @@ def send_message_to_khoj_chat(user_message: str, user_number: str) -> str:
             )
             return {"response": "Sorry, I'm having trouble understanding you. Could you please try again?"}
     except Exception as e:
-        logger.exception("An unexpected error occurred while processing the response from Khoj.")
+        logger.exception(f"An unexpected error occurred while processing the response from Khoj.\nError: {e}")
         return {"response": "I encountered an unexpected issue. Could you please try again?"}