diff --git a/smartassist/src/backend.py b/smartassist/src/backend.py
index 8ab7b6b..92db094 100644
--- a/smartassist/src/backend.py
+++ b/smartassist/src/backend.py
@@ -1,7 +1,7 @@
 
 # Import the necessary functions from ollama, Flask, requests, threading
 from ollama import Client
-from flask import Flask, request, jsonify, send_from_directory, render_template, session, make_response
+from flask import Flask, request, jsonify, send_from_directory, render_template, session, make_response, Response
 from flask_cors import CORS, cross_origin # CORS stands for Cross-Origin Resource Sharing. This is necessary to allow the frontend to make requests to our backend.
 import requests
 import json
@@ -9,6 +9,7 @@ import logging
 import os
 import utils
 from utils import GlobalState
+from pathlib import Path
 
 # Create a logger for this module
 global_state = GlobalState() # Import the singleton that holds global states (e.g., logger)
@@ -38,11 +39,17 @@ app.config['SESSION_TYPE'] = 'filesystem'  # Store sessions on the filesystem
 logger.debug("flask app template folder: %s", app.template_folder) 
 
 @app.route('/')
-def index():
-    """
-    This route serves index.html to connecting clients
+def index() -> Response:
     """
+    This route serves index.html to connecting clients.
 
+    Initializes a new chat session by clearing the chat history in the session object.
+    Retrieves environment variables for the backend API endpoint, host URL of LLMs, and the selected LLM model.
+    Reads the client HTML template from file and passes it to the index.html template along with other necessary parameters.
+
+    Returns:
+        Response: A Flask response containing the rendered index.html template.
+    """
     session['chat_history'] = []   # The session object (actually, a dictonary) holds the chat session
     logger.debug("Entering route '/'")
     api_endpoint = global_state.get_backend_api_ep()  # Retrieve the environment variable 
@@ -75,11 +82,22 @@ def set_session():
 #         return 'No user ID found'
     
 
+
 @app.route('/<path:filename>')
-def serve_static(filename):
+def serve_static(filename: str | Path) -> Response:
+    """
+    Serves a static file from the application's static folder.
+
+    Args:
+        filename (str or os.PathLike[str]): The path to the static file, relative to the STATIC_FOLDER directory.
+
+    Returns:
+        Response: A Flask response containing the contents of the static file.
+    """
     return send_from_directory(app.config['STATIC_FOLDER'], filename)
 
 
+
 # CORS(app, resources={
 #     r"/api/chat": {
 #         "origins": "*",
@@ -87,33 +105,52 @@ def serve_static(filename):
 #     }
 # })
 
-CORS(app, resources={
-    r"/api/chat": {
-        "origins": "*"    
-    }
-})
+# CORS(app, resources={
+#     r"/api/chat": {
+#         "origins": "*"    
+#     }
+# })
     
 @app.route('/api/tags', methods=['GET'])
-def tag(url = "http://localhost:11434/api/tags", headers = None):
-    """Get a list of models for the server located at url."""
+def get_tags(url: str = "http://localhost:11434/api/tags", headers: dict = None) -> dict:
+    """
+    Retrieves a list of available models from a server.
+
+    Args:
+        url (str): The URL of the server to query. Defaults to http://localhost:11434/api/tags.
+        headers (dict, optional): A dictionary of HTTP headers to include in the request. Defaults to None.
+
+    Returns:
+        dict: A JSON response containing a list of available models, or an error message if the request fails.
+
+    Raises:
+        requests.exceptions.RequestException: If there is a problem with the request.
+    """
     try:
         logger.debug(f"url: {url} headers: {headers}")
         response = requests.get(url, headers=headers)
         return response.json()
-        # return response
     except requests.exceptions.RequestException as e:
-        logger.error("Request Exception: %s", str(e))        
+        logger.error("Request Exception: %s", str(e))
         return {'error': 'Failed to process request'}
 
 
+
+
 @app.route('/api/chat', methods=['POST'])
-def chat():
-# def chat(model = "phi3:mini"):
+def chat() -> dict[str, any]:
     """
-    This function handles the chat. The frontend client (web browser) calls the 
-    backend server through this endpoint (/api/chat) that manage queries
-    to the LLM (Large Language Model) server and it also manages the response 
-    from the LLM server.
+    Handles chat functionality by sending a query to an LLM server and 
+    returning the response.
+
+    This endpoint expects a JSON payload with the following structure:
+    {
+        'query': str,
+        'url_server': str (optional),
+        'model': str (optional)
+    }
+
+    :return: A dictionary containing the LLM's response
     """
     # Get the message from the JSON in the request body
     data = request.get_json()
@@ -138,26 +175,7 @@ def chat():
         "stream": False           
     }
     url = url_server
-
-    # TODO: This section should only run when changing to new endpoint...
-    # begin refactor ###################################
-    headers = { # Set default header
-        "Content-Type": "application/json",
-    }
-    found_endpoint = False
-    endpoints = global_state.get_endpoints()
-    for endpoint in endpoints:
-        if endpoint["url"] == url: # Look for endpoint with this url
-            found_endpoint = True
-            if endpoint["provider"] == "ollama": # Currently only supporting ollama servers
-                if "requestOptions" in endpoint:  # Check if authentication is needed
-                    headers.update({
-                        "Authorization": endpoint["requestOptions"]["headers"]["Authorization"]
-                    })
-    if found_endpoint == False:
-        # Raise some error or whatever...
-        logger.debug(f"Host {url} not found")
-    # end refactor ###################################
+    headers = get_auth_headers(url)
 
     try:
         url = url + "/api/generate"
@@ -179,24 +197,53 @@ def chat():
 
 
 @app.route('/api/endpoints', methods=['GET'])
-def get_endpoints():
-    # Replace this with your actual logic to fetch endpoint data
-    # endpoints = [
-    #     {'endpoint': 'endpoint1', 'llm': 'llm1'},
-    #     {'endpoint': 'endpoint1', 'llm': 'llm2'},
-    #     {'endpoint': 'endpoint2', 'llm': 'llm1'},
-    #     {'endpoint': 'endpoint2', 'llm': 'llm3'},
-    #     {'endpoint': 'endpoint2', 'llm': 'llm4'},
-    #     {'endpoint': 'endpoint3', 'llm': 'llm4'},
-    # ]
-    endpoints = [] # List of dictionaries, each of which contains {'endpoint': 'endpoint1', 'llm': 'llm1'}
+def get_endpoints() -> str:
+    """
+    Returns a list of available endpoints with their corresponding LLMs.
+
+    This endpoint fetches all endpoints and their associated LLMs from the global state,
+    then returns them as a JSON response.
+
+    :return: A JSON string representing a dictionary containing a list of dictionaries,
+             each representing an endpoint title and supported LLM.
+    """
+    endpoints = []  # List of dictionaries, each of which contains {'title': 'title1', 'llm': 'llm1'}
     eps = global_state.get_endpoints()
     for ep in eps:
         llms = global_state.get_list_of_available_llms(ep)
         for llm in llms:
-            endpoints.append({'endpoint': ep.get('title'), 'llm': llm})
+            endpoints.append({'title': ep.get('title'), 'llm': llm})
     return jsonify(endpoints)
 
+@app.route('/api/select_endpoint_llm', methods=['POST'])
+def select_endpoint_llm() -> Response:
+    """
+    Selects the endpoint associated with the tuple (title, LLM) from the request body.
+
+    Request Body:
+        - title: str - The title of the endpoint to select.
+        - llm: str - The LLM to set.
+
+    Returns:
+        A JSON response indicating whether the endpoint and LLM were selected successfully.
+
+    Raises:
+        ValueError: If there is not exactly one endpoint with the specified title.
+    """
+    data = request.get_json()
+    title = data['title']
+    llm = data['llm']
+
+    endpoints = global_state.get_endpoints_with_key_value('title', title)
+    if len(endpoints) != 1:
+        raise ValueError(f"Expected exactly one endpoint with title '{title}', found {len(endpoints)}")
+
+    global_state.set_host_url(endpoints[0]['url'])
+    global_state.set_llm(llm)
+    logger.debug(f"Updated to host url {endpoints[0]['url']} and LLM {llm}")
+
+    return jsonify({'message': 'Endpoint and LLM selected successfully'})
+
 
 @app.route('/smartassist', methods=["POST"])
 def smartassist():
@@ -216,6 +263,35 @@ def get_response(user_query):
     response = client.generate_response(user_query)   # Generate and retrieve the response based on user's query
     return response     
 
+def get_auth_headers(url: str) -> dict:
+    """
+    Returns authentication headers for a given URL.
+
+    This function checks if an endpoint with the provided URL exists in the global state,
+    and returns the corresponding authentication headers. If no such endpoint is found,
+    it returns a default header.
+    """
+    # TODO: The full operation should only have to run when changing to new endpoint.
+
+    # Set default header
+    headers = {
+        "Content-Type": "application/json",
+    }
+
+    found_endpoint = False
+    endpoints = global_state.get_endpoints()
+    for endpoint in endpoints:
+        if endpoint["url"] == url:  # Look for endpoint with this URL
+            found_endpoint = True
+            #if endpoint["provider"] == "ollama":  # Currently only supporting ollama servers - not needed if API the same
+            if "requestOptions" in endpoint:  # Check if authentication is needed
+                headers.update({
+                    "Authorization": endpoint["requestOptions"]["headers"]["Authorization"]
+                })
+    if not found_endpoint:
+        logger.debug(f"Host {url} not found")
+
+    return headers
 
 def run_flask(fport=5005):
     """