microsoftgraph
Bug: AttributeError: 'function' object has no attribute 'headers' when using request_configuration lambda/function for messages.get() in v1.26.0
Describe the bug
When attempting to use the request_configuration parameter with the .get() method on a MessagesRequestBuilder (specifically graph_client.users.by_user_id(...).mail_folders.by_mail_folder_id(...).messages.get()), providing a lambda function or a named function to configure query parameters (like $select, $top, $skip, $orderby) results in an AttributeError: 'function' object has no attribute 'headers'.
This error occurs internally within the Kiota request adapter's configure method (kiota_abstractions\request_information.py), indicating that the SDK is incorrectly trying to access attributes on the configuration function itself, rather than executing the function to modify the internal request configuration object before attempting to access its attributes.
Calling the same .get() method without the request_configuration parameter works successfully (confirming authentication and base Mail.Read permissions are correct), but this prevents necessary customization like pagination and field selection.
Attempts to import and use explicit configuration classes like MessagesRequestBuilderGetQueryParameters also fail with an ImportError in this version, suggesting the lambda/function approach is the intended method, but it appears to be broken for this endpoint/version combination.
Expected behavior
The messages.get() call should execute the provided lambda function (request_config_lambda) against an internal request configuration object. The query parameters specified within the lambda ($select, $top, $orderby) should be applied to the outgoing Graph API request. The request should succeed (assuming correct permissions), returning the specified number of messages with the selected fields, ordered accordingly.
Actual Behavior:
The script fails with an AttributeError inside the Kiota request adapter before the API call is made:
AttributeError: 'function' object has no attribute 'headers' Traceback (most recent call last): File "...\minimal_repro.py", line 41, in main # Adjust line number based on final script messages_response = await graph_client.users.by_user_id(user_id).mail_folders.by_mail_folder_id("inbox").messages.get( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ request_configuration=request_config_lambda # <--- FAILS HERE ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ) ^ File "....venv\Lib\site-packages\msgraph\generated\users\item\mail_folders\item\messages\messages_request_builder.py", line 57, in get request_info = self.to_get_request_information( request_configuration ) File "....venv\Lib\site-packages\msgraph\generated\users\item\mail_folders\item\messages\messages_request_builder.py", line 101, in to_get_request_information request_info.configure(request_configuration) ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^ File "....venv\Lib\site-packages\kiota_abstractions\request_information.py", line 93, in configure self.headers.add_all(request_configuration.headers) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'function' object has no attribute 'headers'
How to reproduce
Set up a virtual environment with msgraph-sdk==1.26.0 and its dependencies (azure-identity, python-dotenv, microsoft-kiota-abstractions, etc.).
Create a .env file with valid AZURE_TENANT_ID, AZURE_CLIENT_ID, AZURE_CLIENT_SECRET, and MAILBOX_USER_ID (for a mailbox the App Registration has Mail.Read Application permission + Admin Consent for).
Run the following minimal Python script:
import os import asyncio import logging from dotenv import load_dotenv from azure.identity import ClientSecretCredential from msgraph import GraphServiceClient from kiota_abstractions.api_error import APIError # Or ODataError if preferred
Basic Logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s') logging.getLogger("azure.identity._internal.get_token_mixin").setLevel(logging.ERROR)
Load .env
load_dotenv() tenant_id = os.getenv('AZURE_TENANT_ID') client_id = os.getenv('AZURE_CLIENT_ID') client_secret = os.getenv('AZURE_CLIENT_SECRET') user_id = os.getenv('MAILBOX_USER_ID')
if not all([tenant_id, client_id, client_secret, user_id]): logging.error("Missing environment variables") exit()
async def main(): logging.info("Initializing client...") try: credential = ClientSecretCredential(tenant_id, client_id, client_secret) scopes = ['https://graph.microsoft.com/.default'] graph_client = GraphServiceClient(credentials=credential, scopes=scopes) logging.info("Client initialized. Fetching messages...")
# --- This configuration causes the AttributeError ---
request_config_lambda = lambda request_config: (
hasattr(request_config, 'query_parameters') and request_config.query_parameters is not None and (
setattr(request_config.query_parameters, 'select', ["id", "subject", "receivedDateTime"]),
setattr(request_config.query_parameters, 'top', 5),
setattr(request_config.query_parameters, 'orderby', ["receivedDateTime desc"])
)
)
# --- End Problematic Configuration ---
messages_response = await graph_client.users.by_user_id(user_id).mail_folders.by_mail_folder_id("inbox").messages.get(
request_configuration=request_config_lambda # <--- FAILS HERE
)
# This part is never reached due to the error
if messages_response and messages_response.value:
logging.info(f"Successfully fetched {len(messages_response.value)} emails.")
for msg in messages_response.value:
logging.info(f" - {msg.received_date_time} : {msg.subject}")
else:
logging.info("No messages found or response was empty.")
except APIError as api_error:
logging.error(f"API Error: Status={getattr(api_error, 'response_status_code', 'N/A')}, Message={api_error}", exc_info=True)
except Exception as e:
logging.error(f"Unexpected Error: {e}", exc_info=True)
if name == "main": asyncio.run(main())
SDK Version
1.26
Latest version known to work for scenario above?
None
Known Workarounds
Removing the request_configuration parameter entirely allows the messages.get() call to succeed, fetching the default fields and default page size. However it defeats the purpose of the app in order to collect all the data.
This works, but lacks customization:
messages_response = await graph_client.users.by_user_id(user_id).mail_folders.by_mail_folder_id("inbox").messages.get()
Debug output
Click to expand log
```</details>
### Configuration
msgraph-sdk version: 1.26.0
microsoft-kiota-abstractions version: 1.9.3
azure-identity version: 1.21
Python version: 3.13.2
Operating System: Windows 11
### Other information
_No response_
@Mikael3451 thank you for the detailed steps. This sdk is generated with Kiota therefore, it expects handling request configurations internally in a specific manner. The SDK expects a specific structure for request configurations but when using a lambda function directly, it will try accessing properties of the function object instead of executing it. this is the internal logic the request adapter expects. You can use the request configuration like this
from msgraph.generated.users.item.mail_folders.item.messages.messages_request_builder import MessagesRequestBuilderGetRequestConfiguration
def get_messages(graph_client, user_id, folder_id):
# Create proper request configuration object
request_config = MessagesRequestBuilderGetRequestConfiguration()
# Configure query parameters properly
request_config.query_parameters.select = ["subject", "receivedDateTime", "from"]
request_config.query_parameters.top = 10
request_config.query_parameters.orderby = ["receivedDateTime desc"]
# Make the API call with proper configuration
return graph_client.users.by_user_id(user_id)\
.mail_folders.by_mail_folder_id(folder_id)\
.messages\
.get(request_configuration=request_config)
I updated my sdk to version 1.28, as well as tryed 1.26 and 1.27 and got the same error with your code. The error message explicitly states that the name MessagesRequestBuilderGetRequestConfiguration cannot be found directly within that module.