Need help in FAST API Starlette Request. Please find the errors:

[pypi-ahmad]

First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched the FastAPI documentation, with the integrated search.
• I already searched in Google "How to X in FastAPI" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to FastAPI but to Pydantic.
• I already checked if it is not related to FastAPI but to Swagger UI.
• I already checked if it is not related to FastAPI but to ReDoc.

Commit to Help

• I commit to help with one of those options 👆

Example Code

Error at auth :

'Traceback (most recent call last):\n  File "c:\\Users\\.vscode\\extensions\\ms-python.python-2023.12.0\\pythonFiles\\lib\\python\\debugpy\\_vendored\\pydevd\\_pydevd_bundle\\pydevd_resolver.py", line 189, in _get_py_dictionary\n    attr = getattr(var, name)\n  File " \\env\\lib\\site-packages\\starlette\\requests.py", line 155, in auth\n    ), "AuthenticationMiddleware must be installed to access request.auth"\nAssertionError: AuthenticationMiddleware must be installed to access request.auth\n'


Error at Session
'Traceback (most recent call last):\n  File "c:\\Users\\.vscode\\extensions\\ms-python.python-2023.12.0\\pythonFiles\\lib\\python\\debugpy\\_vendored\\pydevd\\_pydevd_bundle\\pydevd_resolver.py", line 189, in _get_py_dictionary\n    attr = getattr(var, name)\n  File " \env\\lib\\site-packages\\starlette\\requests.py", line 148, in session\n    ), "SessionMiddleware must be installed to access request.session"\nAssertionError: SessionMiddleware must be installed to access request.session\n'

Description

The uvicorn app is created using fastapi. The app is running okay, but when trying to send any request locally, it is showing an error "HTTP/1.1 500 Internal Server Error", It seems like the error occurs while send authentication request that return nothing due to authorizatio failure.

This is how our request looks like :

Error at auth :

'Traceback (most recent call last):\n File "c:\Users\.vscode\extensions\ms-python.python-2023.12.0\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_resolver.py", line 189, in _get_py_dictionary\n attr = getattr(var, name)\n File " \env\lib\site-packages\starlette\requests.py", line 155, in auth\n ), "AuthenticationMiddleware must be installed to access request.auth"\nAssertionError: AuthenticationMiddleware must be installed to access request.auth\n'

Error at Session
'Traceback (most recent call last):\n File "c:\Users\.vscode\extensions\ms-python.python-2023.12.0\pythonFiles\lib\python\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_resolver.py", line 189, in _get_py_dictionary\n attr = getattr(var, name)\n File " \env\lib\site-packages\starlette\requests.py", line 148, in session\n ), "SessionMiddleware must be installed to access request.session"\nAssertionError: SessionMiddleware must be installed to access request.session\n'

This is uvicorn application running :

We installed startlette as well - pip install starlette-auth-toolkit
Not sure why Authorization Failure is happening. Any help is greatly appreciated.

Operating System

Windows

Operating System Details

No response

FastAPI Version

0.89.0

Python Version

Python 3.9.1

Additional Context

No response

[jgould22]

As the error message says you need to install the SessionMiddleware and AuthenticationMiddleware

It is going to look something like

from fastapi import FastAPI
from starlette.middleware.sessions import SessionMiddleware
from starlette.middleware.authentication import AuthenticationMiddleware

app = FastAPI()
# More options here https://www.starlette.io/middleware/#sessionmiddleware
app.add_middleware(SessionMiddleware, secret_key="some_key")
# More here https://www.starlette.io/authentication/
app.add_middleware(AuthenticationMiddleware, backend=SomeBackend)

[pypi-ahmad]

Shall I install this in main.py file?

[jgould22]

You need to add the middleware to your application instance, if that is in your main.py then you can add it there.

[pypi-ahmad]

We are using this piece of code

"""

from fastapi import FastAPI, Request

app = FastAPI()

globals.initialize_app_globals()
globals.initialize_logger()
obj_logging_app_insights = globals.obj_logging_app_insights

@app.middleware("http")
async def initialize_app(req: Request, next):
try:

    if 'X-Arr-Log-Id' in req.headers:
        globals.LOGID = req.headers['X-Arr-Log-Id']
   
    
    globals.obj_logging_app_insights.logger.info(f"{globals.LOGID} - Request came to the fastapi-middleware")
    # with obj_logging_app_insights.tracer.span("main") as span:
    # 
    #     span.span_kind = SpanKind.SERVER
    response = await next(req)
   
    return response

except ConnectionError as e:
obj_logging_app_insights.set_custom_property({constants.SQL_STATUS_CODE: constants.SQL_STATUS_MESSAGE})
obj_logging_app_insights.log_custom_property_to_app_insights(e)
res = response.create_response(status_code = constants.SQL_STATUS_CODE)
return res
except Exception as e:
res = response.create_response(status_code = constants.GENERIC_EXCEPTION_STATUS_CODE)
obj_logging_app_insights.set_custom_property({constants.GENERIC_EXCEPTION_STATUS_CODE : constants.GENERIC_EXCEPTION_STATUS_MESSAGE})
obj_logging_app_insights.log_custom_property_to_app_insights(e)
return res
"""

We are using decorators, this @app.middleware("http")

while getting request, there is some issue with authentication middleware and session middleware.

[jgould22]

The decorators are for defining your own middleware.

You need to use middleware from starlette with app.add_middleware as shown below.

# More options here https://www.starlette.io/middleware/#sessionmiddleware
app.add_middleware(SessionMiddleware, secret_key="some_key")
# More here https://www.starlette.io/authentication/
app.add_middleware(AuthenticationMiddleware, backend=SomeBackend)

also note: SomeBackend is not a real backend you will have to define this yourself. Check this link for more information https://www.starlette.io/authentication/