[QUESTION] How to redirect to another page

How can I redirect to another page/endpoint after, for instance, authenticating a user?

In flask, we can use ‘request’ function to redirect to a another page/endpoint, but I don’t see how to do it with FastAPI.

from flask import Flask,redirect

app = Flask(__name__)

@app.route('/')
def hello():
    return redirect("http://www.example.com")

[tiangolo]

Thanks @euri10 !

Before you commit the time to adding it in the docs, @marcosmmb, does @euri10’s example solve your use case?

Let me copy it inline here:

import logging

from fastapi import FastAPI
from starlette.responses import RedirectResponse
from starlette.testclient import TestClient

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

app = FastAPI()


@app.get("/app")
def read_main():
    return {"message": "Hello World from main app"}


subapi = FastAPI(openapi_prefix="/subapi")


@subapi.get("/sub")
async def read_sub():
    return {"message": "Hello World from sub API"}


@subapi.get("/redirect")
async def redirect():
    url = app.url_path_for("redirected")
    response = RedirectResponse(url=url)
    return response


@subapi.get("/redirected")
async def redirected():
    logger.debug("REDIRECTED")
    return {"message": "you've been redirected"}


app.mount("/subapi", subapi)


client = TestClient(app)


def test_redirect_subapi():
    url = app.url_path_for("redirect")
    response = client.get(url)
    assert response.json() == {"message": "you've been redirected"}

[euri10]

simple code tested and working, couldn’t while afk, the logs show clearly you’re redirected to /redirected once you hit /redirect

hope it helps

@app.get("/redirect")
async def redirect():
    response = RedirectResponse(url='/redirected')
    return response


@app.get("/redirected")
async def redirected():
    logger.debug("debug message")
    return {"message": "you've been redirected"}

backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,342 - uvicorn - DEBUG - ('192.168.96.1', 39694) - Connected
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,342 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [6] Initialized {'type': 'http', 'http_version': '1.1', 'server': ('192.168.96.3', 8000), 'client': ('192.168.96.1', 39694), 'scheme': 'http', 'method': 'GET', 'root_path': '', 'path': '/redirect', 'query_string': b'', 'headers': '<...>'}
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,343 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [6] Started task
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,344 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [6] Received {'type': 'http.response.start', 'status': 302, 'headers': '<...>'}
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,344 - uvicorn - INFO - ('192.168.96.1', 39694) - "GET /redirect HTTP/1.1" 302
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,344 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [6] Received {'type': 'http.response.body', 'body': '<0 bytes>'}
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,344 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [6] Completed
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,349 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [7] Initialized {'type': 'http', 'http_version': '1.1', 'server': ('192.168.96.3', 8000), 'client': ('192.168.96.1', 39694), 'scheme': 'http', 'method': 'GET', 'root_path': '', 'path': '/redirected', 'query_string': b'', 'headers': '<...>'}
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,349 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [7] Started task
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,350 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [7] Received {'type': 'http.response.start', 'status': 200, 'headers': '<...>'}
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,350 - uvicorn - INFO - ('192.168.96.1', 39694) - "GET /redirected HTTP/1.1" 200
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,350 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [7] Received {'type': 'http.response.body', 'body': '<36 bytes>'}
backend_1_d9db6d632ea8 | 2019-05-07 06:58:12,351 - uvicorn - DEBUG - ('192.168.96.1', 39694) - ASGI [7] Completed
backend_1_d9db6d632ea8 | 2019-05-07 06:58:17,351 - uvicorn - DEBUG - ('192.168.96.1', 39694) - Disconnected