How can I prevent "307 Temporary Redirect" while accessing FastAPI via an Android Emulator on local machine

The FastAPI REST API is working great when checked in the local browser and with the Advanced REST client Chrome plugin (only while using the XHR enabled).

But in no way are the same API accessible via the Android App running inside an emulator.

The info message in FastAPI console when accessed via Android App

127.0.0.1:57083 - "POST /v1/login HTTP/1.1" 307 Temporary Redirect

This is what is configured while loading the FastAPI

api = FastAPI(title=PROJECT_NAME)

if not ALLOWED_HOSTS:
    ALLOWED_HOSTS = ["*"]

api.add_middleware(
    CORSMiddleware,
    allow_origins=ALLOWED_HOSTS,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

Any help would be greatly appreciated.

[dmontagu]

Yeah, you can see it is trying to redirect you to the endpoint with a trailing slash:

< HTTP/1.1 307 Temporary Redirect
< date: Mon, 25 Nov 2019 03:22:56 GMT
< server: uvicorn
< location: http://localhost:8000/v1/login/

The problem is in code you didn’t share – wherever you’ve defined your endpoint, the path you are providing is ending with a "/". If you remove that trailing slash (or put a ? after it, if you want it to work both ways), this issue should go away.

It works in a browser just fine because the browser is just following the redirect automatically.

[dmontagu]

Hard to say exactly what’s going on here without more detail (eg, what are the raw 307 http response contents? what is the redirect url? what do the server request logs contain?) but my guess is something is going on with a trailing slash. Possibly your android client is modifying the url to add a trailing slash? Or maybe performing some other url modification starlette is able to handle via redirect?