feat: add host params to bingAI.

[but seems not work in China]

api/.env.example

@@ -41,6 +41,11 @@ OPENAI_KEY=
 # Leave it and BINGAI_USER_TOKEN blank to disable this endpoint.
 BINGAI_TOKEN=
 
+# BingAI Host:     
+# Necessary for some people in different countries, e.g. China (https://cn.bing.com)
+# Leave it blank to use default server.
+# BINGAI_HOST="https://cn.bing.com"
+
 # BingAI User defined Token
 # Allow user to set their own token by client
 # Uncomment this to enable this feature.

api/app/clients/bingai.js

@@ -27,6 +27,7 @@ const askBing = async ({
     // cookies: '',
     debug: false,
     cache: store,
+    host: process.env.BINGAI_HOST || null,
     proxy: process.env.PROXY || null
   });