[Solved] Examine the following FastAPI CORS middleware setup:app.add_middleware( CORSMiddleware, allow_origins=["https://example.... | FastAPI

FastAPI - Middleware and Hooks

Examine the following FastAPI CORS middleware setup:

app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://example.com"],
    allow_methods="GET,POST",
    allow_headers=["*"]
)

What is the issue with this configuration?

Aallow_origins cannot contain a single URL in a list.

Ballow_methods should be a list of methods, not a comma-separated string.

Callow_headers cannot contain wildcard '*' in FastAPI.

DCORSMiddleware must be imported from fastapi.middleware.cors, not fastapi.middleware.

Step-by-Step Solution

Solution:

Step 1: Check allow_methods type
allow_methods must be a list of HTTP methods, e.g., ["GET", "POST"].
Step 2: Identify the error
Here, allow_methods is a string "GET,POST", which is invalid.
Step 3: Verify other parameters
allow_origins as a list with one URL is valid; allow_headers with ["*"] is allowed.
Final Answer:
allow_methods should be a list of methods, not a comma-separated string. -> Option B
Quick Check:
Ensure allow_methods is a list, not a string. [OK]

Quick Trick: allow_methods must be a list, not a comma-separated string. [OK]

Common Mistakes:

MISTAKES

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