Example fastapi main.py what allows cors:22.06.21

from fastapi    import FastAPI
from .views     import main, margin, invoice, kpi_new_customer_orders
from fastapi.middleware.cors import CORSMiddleware
origins = [
    "*",
    "http://localhost",
    "http://127.0.0.1",
]

app = FastAPI()

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

def configure():
    # /                                                                                                                                                                            
    # /test                                                                                                                                                                        
    # /items/{item_id}                                                                                                                                                             
    app.include_router(main.router)

# /margin_report                                                                                                                                                               
    app.include_router(margin.router)

# /margin_report                                                                                                                                                               
    app.include_router(invoice.router)

# /kpi_new_customer_orders                                                                                                                                                     
    app.include_router(kpi_new_customer_orders.router)

configure()

test with: 
 curl -H "Origin: http://myridia.com" --verbose http://foo.com
 should than include : < access-control-allow-origin: *

https://fastapi.tiangolo.com/tutorial/cors/

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Example fastapi main.py what allows cors:22.06.21

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