[Solved] Identify the error in this FastAPI CORS middleware setup: app.add_middleware( CORSMiddleware, allow_origins="*", allow_methods=["GET", "POST"], allow_headers=["*"] ) | FastAPI

FastAPI - Middleware and Hooks

Identify the error in this FastAPI CORS middleware setup:

app.add_middleware(
    CORSMiddleware,
    allow_origins="*",
    allow_methods=["GET", "POST"],
    allow_headers=["*"]
)

ACORSMiddleware must be imported from fastapi.middleware.security

Ballow_methods should be a string, not a list

Callow_headers cannot contain '*'

Dallow_origins should be a list, not a string

Step-by-Step Solution

Solution:

Step 1: Check allow_origins type
allow_origins must be a list of strings, but here it is a single string "*".
Step 2: Verify other parameters
allow_methods is correctly a list, allow_headers can accept ["*"] as a list.
Final Answer:
allow_origins should be a list, not a string -> Option D
Quick Check:
allow_origins requires a list [OK]

Quick Trick: Always use a list for allow_origins, even if one item [OK]

Common Mistakes:

MISTAKES

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