How to use middleware with routing in FastAPI [duplicate]

Question

I am following the FastAPI documentation here and trying to implement routing with a middleware. My main contains:

app = FastAPI()


app.include_router(
    SomeService.router,
    prefix="/services",
    tags=["services"]
)


@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.time()
    response = await call_next(request)
    process_time = time.time() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    return response

When sending a request, it is correctly executed and returns the right value but does not contain the value appended through the middleware.

I have tried defining the middleware inside the service route and defining the middleware before app.include_router

luckydonald · Accepted Answer · 2020-01-03 02:42:03Z

1

The documentation about middleware mentions that if

(...) you want a client in a browser to be able to see [the custom headers], you need to add them to your CORS configurations, using the parameter expose_headers documented in Starlette's CORS docs.

answered Jan 3, 2020 at 2:42

luckydonald

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1 Comment

Dani Mazahreh Over a year ago

Yes and i have read that. It is working fine but a mistake on my behalf reading the headers. Thanks

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