[Azure] add example snippet on how to refresh AAD tokens (#435)

* add how to refresh aad tokens example

* remove accidental config

examples/azure/chat.ipynb

@@ -89,6 +89,45 @@
     "# openai.api_key = token.token"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "A token is valid for a period of time, after which it will expire. To ensure a valid token is sent with every request, you can refresh an expiring token by hooking into requests.auth:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import typing\n",
+    "import time\n",
+    "import requests\n",
+    "if typing.TYPE_CHECKING:\n",
+    "    from azure.core.credentials import TokenCredential\n",
+    "\n",
+    "class TokenRefresh(requests.auth.AuthBase):\n",
+    "\n",
+    "    def __init__(self, credential: \"TokenCredential\", scopes: typing.List[str]) -> None:\n",
+    "        self.credential = credential\n",
+    "        self.scopes = scopes\n",
+    "        self.cached_token: typing.Optional[str] = None\n",
+    "\n",
+    "    def __call__(self, req):\n",
+    "        if not self.cached_token or self.cached_token.expires_on - time.time() < 300:\n",
+    "            self.cached_token = self.credential.get_token(*self.scopes)\n",
+    "        req.headers[\"Authorization\"] = f\"Bearer {self.cached_token.token}\"\n",
+    "        return req\n",
+    "\n",
+    "session = requests.Session()\n",
+    "session.auth = TokenRefresh(default_credential, [\"https://cognitiveservices.azure.com/.default\"])\n",
+    "\n",
+    "openai.requestssession = session"
+   ]
+  },
   {
    "attachments": {},
    "cell_type": "markdown",

examples/azure/completions.ipynb

@@ -89,6 +89,45 @@
     "# openai.api_key = token.token"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "A token is valid for a period of time, after which it will expire. To ensure a valid token is sent with every request, you can refresh an expiring token by hooking into requests.auth:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import typing\n",
+    "import time\n",
+    "import requests\n",
+    "if typing.TYPE_CHECKING:\n",
+    "    from azure.core.credentials import TokenCredential\n",
+    "\n",
+    "class TokenRefresh(requests.auth.AuthBase):\n",
+    "\n",
+    "    def __init__(self, credential: \"TokenCredential\", scopes: typing.List[str]) -> None:\n",
+    "        self.credential = credential\n",
+    "        self.scopes = scopes\n",
+    "        self.cached_token: typing.Optional[str] = None\n",
+    "\n",
+    "    def __call__(self, req):\n",
+    "        if not self.cached_token or self.cached_token.expires_on - time.time() < 300:\n",
+    "            self.cached_token = self.credential.get_token(*self.scopes)\n",
+    "        req.headers[\"Authorization\"] = f\"Bearer {self.cached_token.token}\"\n",
+    "        return req\n",
+    "\n",
+    "session = requests.Session()\n",
+    "session.auth = TokenRefresh(default_credential, [\"https://cognitiveservices.azure.com/.default\"])\n",
+    "\n",
+    "openai.requestssession = session"
+   ]
+  },
   {
    "attachments": {},
    "cell_type": "markdown",

examples/azure/embeddings.ipynb

@@ -89,6 +89,45 @@
     "# openai.api_key = token.token"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "A token is valid for a period of time, after which it will expire. To ensure a valid token is sent with every request, you can refresh an expiring token by hooking into requests.auth:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import typing\n",
+    "import time\n",
+    "import requests\n",
+    "if typing.TYPE_CHECKING:\n",
+    "    from azure.core.credentials import TokenCredential\n",
+    "\n",
+    "class TokenRefresh(requests.auth.AuthBase):\n",
+    "\n",
+    "    def __init__(self, credential: \"TokenCredential\", scopes: typing.List[str]) -> None:\n",
+    "        self.credential = credential\n",
+    "        self.scopes = scopes\n",
+    "        self.cached_token: typing.Optional[str] = None\n",
+    "\n",
+    "    def __call__(self, req):\n",
+    "        if not self.cached_token or self.cached_token.expires_on - time.time() < 300:\n",
+    "            self.cached_token = self.credential.get_token(*self.scopes)\n",
+    "        req.headers[\"Authorization\"] = f\"Bearer {self.cached_token.token}\"\n",
+    "        return req\n",
+    "\n",
+    "session = requests.Session()\n",
+    "session.auth = TokenRefresh(default_credential, [\"https://cognitiveservices.azure.com/.default\"])\n",
+    "\n",
+    "openai.requestssession = session"
+   ]
+  },
   {
    "attachments": {},
    "cell_type": "markdown",