mypy updates

Author: tonybaloney

app/backend/app.py

@@ -473,8 +473,6 @@ async def setup_clients():
     USE_BING_SEARCH = os.getenv("USE_BING_SEARCH", "").lower() == "true"
     BING_SEARCH_API_KEY = os.getenv("BING_SEARCH_API_KEY")
     BING_SEARCH_ENDPOINT = os.getenv("BING_SEARCH_ENDPOINT")
-    if BING_SEARCH_ENDPOINT is not None and BING_SEARCH_ENDPOINT.trim() == "":
-        BING_SEARCH_ENDPOINT = None
 
     # WEBSITE_HOSTNAME is always set by App Service, RUNNING_IN_PRODUCTION is set in main.bicep
     RUNNING_ON_AZURE = os.getenv("WEBSITE_HOSTNAME") is not None or os.getenv("RUNNING_IN_PRODUCTION") is not None

app/backend/approaches/chatreadretrieveread.py

@@ -137,7 +137,7 @@ async def keyword_rewrite(rendered_prompt, tools):
         )
         tools: List[ChatCompletionToolParam] = self.query_rewrite_tools
         query_messages, query_text = await keyword_rewrite(rendered_query_prompt, tools)
-        if use_bing_search:
+        if use_bing_search and self.bing_client:
             bing_search_prompt = self.prompt_manager.render_prompt(
                 self.bing_ground_rewrite_prompt,
                 {"user_query": original_user_query, "past_messages": messages[:-1]},

app/backend/bing_client.py

@@ -2,7 +2,7 @@
 An async client for Bing Web Search API.
 """
 
-from typing import Optional
+from typing import Optional, Union
 
 import httpx
 from pydantic import BaseModel, ConfigDict
@@ -47,7 +47,7 @@ def __init__(self, api_key: str, bing_endpoint: Optional[str] = "api.bing.micros
         }
 
     async def search(self, query: str) -> WebAnswer:
-        params = {
+        params: dict[str, Union[str,bool]]  = {
             "q": query,
             "textDecorations": True,
             "textFormat": "HTML",